Question

$7 (x - 7) = y - 7 \\ 7x - 49 \: = y - 7 \\ \: 7x - y = \\ and \\ 3(x - 3) = y + 3 \\ \:3x + 9 \: \: \: = y + 3 \\ 3x - y =$

Answer 1

Hey!!
Here is your answer..

$7(x - 7) = y - 7 \\ 7x - 49 = y - 7 \\ 7x - y = - 7 + 49 \\ \bold{7x - y =42}$
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$3(x - 3) = y + 3 \\ 3x - 9 = y + 3 \\ 3x - y = 3 + 9 \\ \bold {3x - y = 12}$
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This are the answers.
I hope it helps you.