{"id":57756,"date":"2025-08-28T17:11:11","date_gmt":"2025-08-28T11:41:11","guid":{"rendered":"https:\/\/e-gmat.com\/blogs\/?p=57756"},"modified":"2025-09-04T19:46:26","modified_gmt":"2025-09-04T14:16:26","slug":"what-values-of-x-have-a-corresponding-value-of-y-that-satisfies-both","status":"publish","type":"post","link":"https:\/\/e-gmat.com\/blogs\/what-values-of-x-have-a-corresponding-value-of-y-that-satisfies-both\/","title":{"rendered":"What values of x have a corresponding value of y that satisfies both xy > 0 and xy ="},"content":{"rendered":"<span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">A <\/span> <span class=\"rt-time\">4<\/span> <span class=\"rt-label rt-postfix\">min read <\/span><\/span>\n<p><strong>Question:<\/strong> What values of x have a corresponding value of y that satisfies both xy &gt; 0 and xy = x + y ?<\/p>\n\n\n\n<p><strong>Options:<\/strong> <\/p>\n\n\n\n<p>A. x &lt;= 1 <\/p>\n\n\n\n<p>B. -1 &lt; x &lt;= 0 <\/p>\n\n\n\n<p>C. 0 &lt; x &lt;= 1 <\/p>\n\n\n\n<p>D. x &gt; 1 <\/p>\n\n\n\n<p>E. All real numbers<\/p>\n\n\n\n<h2 id=\"h-solution-section\">Solution Section<\/h2>\n\n\n\n<p><strong>Solution:<\/strong><\/p>\n\n\n\n<ul><li>Translate the problem requirements: We need values of x where there exists a corresponding y such that both xy &gt; 0 (x and y have the same sign) AND xy = x + y (the product equals the sum)<\/li><li>Solve for y in terms of x: Use the equation xy = x + y to express y as a function of x, determining when this relationship is valid<\/li><li>Apply the sign constraint: Use the condition xy &gt; 0 to determine which values of x allow for valid y values that satisfy both conditions<\/li><li>Verify the solution set: Test boundary values and confirm the range of x that works<\/li><\/ul>\n\n\n\n<h3 id=\"h-execution-of-strategic-approach\">Execution of Strategic Approach<\/h3>\n\n\n\n<ol><li>Translate the problem requirements<\/li><\/ol>\n\n\n\n<p>Let&#8217;s break down what this problem is asking in plain English. We need to find values of x where we can find a corresponding y such that BOTH of these things happen: \u2022 xy &gt; 0: This means x and y have the same sign (both positive or both negative) \u2022 xy = x + y: The product of x and y equals their sum<\/p>\n\n\n\n<p>Think of it this way: imagine you have two numbers x and y. When you multiply them together, you get the same result as when you add them together. And on top of that, both numbers must have the same sign.<\/p>\n\n\n\n<p>Process Skill: TRANSLATE &#8211; Converting the mathematical conditions into clear requirements we can work with<\/p>\n\n\n\n<ol start=\"2\"><li>Solve for y in terms of x<\/li><\/ol>\n\n\n\n<p>Now let&#8217;s use the equation xy = x + y to find y in terms of x. This will help us understand when such a y can exist.<\/p>\n\n\n\n<p>Starting with: xy = x + y<\/p>\n\n\n\n<p>Let&#8217;s rearrange this to get all terms with y on one side: xy &#8211; y = x<\/p>\n\n\n\n<p>Factor out y: y(x &#8211; 1) = x<\/p>\n\n\n\n<p>So: y = x\/(x &#8211; 1)<\/p>\n\n\n\n<p>But wait! This formula only works when x \u2260 1, because we can&#8217;t divide by zero when x &#8211; 1 = 0.<\/p>\n\n\n\n<p>Let&#8217;s check what happens when x = 1: If x = 1, our original equation xy = x + y becomes 1 \u00b7 y = 1 + y, which gives us y = 1 + y. This is impossible since it would mean 0 = 1.<\/p>\n\n\n\n<p>So for any valid solution, we need x \u2260 1, and y = x\/(x &#8211; 1).<\/p>\n\n\n\n<p>Process Skill: MANIPULATE &#8211; Algebraic rearrangement to express y in terms of x<\/p>\n\n\n\n<ol start=\"3\"><li>Apply the sign constraint<\/li><\/ol>\n\n\n\n<p>Now we use the condition xy &gt; 0, which means x and y must have the same sign.<\/p>\n\n\n\n<p>We know y = x\/(x &#8211; 1), so xy = x \u00b7 x\/(x &#8211; 1) = x\u00b2\/(x &#8211; 1)<\/p>\n\n\n\n<p>For xy &gt; 0, we need x\u00b2\/(x &#8211; 1) &gt; 0.<\/p>\n\n\n\n<p>Since x\u00b2 is always positive (except when x = 0), the sign of this expression depends entirely on the sign of (x &#8211; 1): \u2022 If x &#8211; 1 &gt; 0 (meaning x &gt; 1), then x\u00b2\/(x &#8211; 1) &gt; 0 \u2713 \u2022 If x &#8211; 1 &lt; 0 (meaning x &lt; 1), then x\u00b2\/(x &#8211; 1) &lt; 0 \u2717<\/p>\n\n\n\n<p>But wait, we also need to check what happens when x = 0: If x = 0, then y = 0\/(0-1) = 0, and xy = 0 \u00b7 0 = 0, which doesn&#8217;t satisfy xy &gt; 0.<\/p>\n\n\n\n<p>Therefore, we need x &gt; 1 for both conditions to be satisfied.<\/p>\n\n\n\n<p>Process Skill: APPLY CONSTRAINTS &#8211; Using the sign requirement to determine valid x values<\/p>\n\n\n\n<ol start=\"4\"><li>Verify the solution set<\/li><\/ol>\n\n\n\n<p>Let&#8217;s test our conclusion with a concrete example:<\/p>\n\n\n\n<p>Try x = 2: Then y = 2\/(2-1) = 2\/1 = 2 Check: xy = 2 \u00b7 2 = 4, and x + y = 2 + 2 = 4 \u2713 Also: xy = 4 &gt; 0 \u2713<\/p>\n\n\n\n<p>Try x = 0.5: Then y = 0.5\/(0.5-1) = 0.5\/(-0.5) = -1 Check: xy = 0.5 \u00b7 (-1) = -0.5, and x + y = 0.5 + (-1) = -0.5 \u2713 But: xy = -0.5 &lt; 0 \u2717<\/p>\n\n\n\n<p>This confirms that x &gt; 1 is indeed the correct condition.<\/p>\n\n\n\n<ol start=\"5\"><li>Final Answer<\/li><\/ol>\n\n\n\n<p>The values of x that satisfy both conditions are x &gt; 1.<\/p>\n\n\n\n<p>Looking at the answer choices, this corresponds to choice D. x &gt; 1.<\/p>\n\n\n\n<h3 id=\"h-common-faltering-points\">Common Faltering Points<\/h3>\n\n\n\n<p><strong>Errors while devising the approach<\/strong><\/p>\n\n\n\n<ol><li><strong>Misinterpreting the constraint xy &gt; 0<\/strong> Students often misunderstand what xy &gt; 0 means. They might think it simply means &#8220;x and y are both positive&#8221; instead of understanding that it means &#8220;x and y have the same sign&#8221; (both positive OR both negative). This leads them to only consider positive values and miss part of the analysis.<\/li><li><strong>Treating the conditions as separate instead of simultaneous<\/strong> Some students approach this by first finding all x where xy &gt; 0 could be satisfied, then separately finding where xy = x + y could be satisfied, rather than recognizing that we need to find x values where BOTH conditions can be satisfied by the SAME y value simultaneously.<\/li><li><strong>Forgetting to check for domain restrictions<\/strong> Students may dive straight into algebraic manipulation without considering whether certain values of x might make the problem undefined or impossible to solve, particularly when x = 1 makes the denominator zero.<\/li><\/ol>\n\n\n\n<p><strong>Errors while executing the approach<\/strong><\/p>\n\n\n\n<ol><li><strong>Algebraic manipulation errors when solving for y<\/strong> When rearranging xy = x + y to get y = x\/(x-1), students commonly make errors such as incorrectly factoring out y or making sign errors. They might get y = x\/(1-x) instead of y = x\/(x-1).<\/li><li><strong>Incorrect sign analysis for the inequality<\/strong> When analyzing x\u00b2\/(x-1) &gt; 0, students often forget that x\u00b2 is always non-negative, and incorrectly conclude that both the numerator and denominator need to be analyzed for sign changes. They may create incorrect sign charts or miss the fact that x = 0 makes the entire expression equal to 0.<\/li><li><strong>Missing the special case x = 0<\/strong> Even after correctly finding that x &gt; 1 works, students often forget to explicitly check what happens when x = 0, since x\u00b2 = 0 makes the analysis different from other cases where x\u00b2 &gt; 0.<\/li><\/ol>\n\n\n\n<p><strong>Errors while selecting the answer<\/strong><\/p>\n\n\n\n<ol><li><strong>Including the boundary point x = 1<\/strong> After determining that we need x &#8211; 1 &gt; 0, some students incorrectly conclude that x \u2265 1 satisfies the conditions, forgetting that x = 1 was specifically excluded because it makes the original equation impossible to solve.<\/li><li><strong>Confusing which inequality direction to use<\/strong> Students might correctly identify that the boundary is at x = 1 but then select x &lt; 1 instead of x &gt; 1, especially if they made a sign error earlier and didn&#8217;t catch it through verification.<\/li><li><\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Question: What values of x have a corresponding value of y that satisfies both xy &gt; 0 and xy = x + y ? Options: A. x &lt;= 1 B. -1 &lt; x &lt;= 0 C. 0 &lt; x &lt;= 1 D. x &gt; 1 E. All real numbers Solution Section Solution: Translate the problem [&hellip;]<\/p>\n","protected":false},"author":102457,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","ub_ctt_via":""},"categories":[44,100],"tags":[],"featured_image_src":null,"author_info":{"display_name":"Kashish Garg","author_link":"https:\/\/e-gmat.com\/blogs\/author\/kashish\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.1.1 (Yoast SEO v17.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What values of x have a corresponding value of y that satisfies both xy &gt; 0 and xy =<\/title>\n<meta name=\"description\" content=\"What values of x have a corresponding value of y that satisfies both xy &gt; 0 and xy = x + y ? 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