Question

if 4x - y = 13 and 3x - 2y = 7 then what is the average of x and y
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Answer 1

Step-by-step explanation:

$4x - y = 13$

$3x - 2y = 7$

$4x - y + 3x - 2y = 13 + 7$

$7x - 3y = 20$

$7x = 20 + 3y$

$x = \frac{20 + y}{7}$

$4( \frac{20 + y}{7} ) - y = 13$

$80 + 4y = 7(13 + y)$

$80 - 91 = 7y - 4y$

$- 11 = 3y$

$y = \frac{ - 11}{3}$

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