You can put this solution on YOUR website! For these equations
-4x-8y=28
5x-7y=-1
let's multiply the top one by 5 and the bottom one by 4 and add them get
-20x - 40y = 140
20x - 28y = -4
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-68y = 136
y = -2
Now substitute that back in and get
5x - 7(-2) = -1
5x + 14 = -1
5x = -15
x = -3
