Question : What are the values of $x$ and $y$, respectively, from the following equations? $6x + 7y = 5xy$ $10y – 4x = 4xy$
Option 1: 3 and 4
Option 2: 4 and 5
Option 3: 2 and 4
Option 4: 2 and 5
Correct Answer: 2 and 4
Solution : Here, we have, $6x + 7y = 5xy$ .................( 1) $10y - 4x = 4xy$.................( 2) On dividing eq(1) and eq(2) by xy, we get, $⇒ \frac{6}{y} + \frac{7}{x} = 5$............(3) $⇒ \frac{10}{x} - \frac{4}{y} = 4$..............(4) Now, multiply eq(3) by 2 and eq(4) by 3, we get, $⇒ \frac{12}{y} + \frac{14}{x} = 10$ ...............(5) $⇒ \frac{30}{x} - \frac{12}{y} = 12$..............( 6) Now, eq(5) + eq(6) $⇒ \frac{14}{x} + \frac{30}{x} = 22$ $⇒ \frac{44}{x} = 22$ $⇒x = 2 $ Now, put the value of $x = 2$ in the eq(1), we get, $⇒ 6 × 2 + 7y = 5 × 2y$ $⇒ 12 = 3y$ $⇒ y = 4$ $\therefore$ The values of $x$ and $y$ are 2 and 4, respectively. Hence, the correct answer is 2 and 4.
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