2x - 3y = -7
When x = 4: 2(4) - 3y = -7
= 8 - 3y = -7
Subtract 8 from each side: -3y = -7 - 8
= -3y = -15
Divide each side by 3: -y = -5
Multiply each side by -1: y = 5 (You could have divided each side by -3 to get y = 5 as well.)
y=5
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Verified answer
2x - 3y = -7
When x = 4: 2(4) - 3y = -7
= 8 - 3y = -7
Subtract 8 from each side: -3y = -7 - 8
= -3y = -15
Divide each side by 3: -y = -5
Multiply each side by -1: y = 5 (You could have divided each side by -3 to get y = 5 as well.)
y=5