×+7y=-37
4×-3y=7
solve by substitution

X+7y=-37
4x-3y=7

Subtract 7y on both sides for the first problem
x=-37-7y
4x-3y=7

Substitute the x in the second problem for -37-7y
4(-37-7y)-3y=7

Multiply the 4 with -37 and -7y
-148-28y-3y=7

subtract the -28 with -3y
-148-31y=7

add 148 on both sides
-31y=155

divide the -31 on both sides to solve for y
y=-5

To solve for x substitute the y for -5 in the first problem
x=-37-7(-5)

Multiply the -7 with -5
x=-37+35

Add the -37 with the 35 to solve for x
x=-2

Your answers
y=-5
x=-2
(-2,-5)

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