Question

find the value of x-y , if 5x+4y=14 and 4x+5y=13
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Answer 1

$5x + 4y = 14 \\ (5 \times 2) + (4 \times 1) = 14 \\ 10 + 4 = 14 \\ 4x + 5y = 13 \\ (4 \times 2) + (5 \times 1) = 13 \\ 8 + 5 = 13$

So, X = 2

y = 1

Then, X-y = 2-1 =1