Question

if 7 x + 3 Y = 11 and 3 X + 7 Y is = - 1 then x-y =____

Answer 1

I hope it's clear to you
answer is 3
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Answer 2

$7x + 3y = 11 \: \: \: a \\ 3x + 7y = - 1 \: \: \: b \\ \\ subtracting \: a \: by \: b \\ \\ 7x \: + \: 3y = 11 \\ - 3x + 7y = - 1 \\ \\ we \: get \\ \\ 4x - 4y = 12 \: \: \: \: \: \: \: \: \: c \\ \\ dividing \: c \: by \: 4 \: we \: get \\ \\ x - y = 3$
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