Question

7x + 5y = 36 ; 5x + 7y = 12 find ( x- y )

Answer 1

Step-by-step explanation:

$7x + 5y = 36 \: \: \: \: \: eq(1) \\ 5x + 7y = 12 \: \: \: \: \: \: \: eq(2) \\ eq(1) - eq(2) \\ (7x + 5y) - (5x + 7y) = 36 - 12 \\ 7x + 5y - 5x - 7y = 24 \\ 2x - 2y = 24 \\ 2(x - y) = 24 \\ (x - y) = \frac{24}{2} \\ (x - y) = 12$

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