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You need more information to solve for x and y. One answer is x=3 and y=1.
4x+2y = 20 2y = -4x+20 y = -2x+10
If: -4x+2y = 9 Then: 2y = 4x+9 Divide all terms by 2: y = 2x+4.5 which is now in slope intercept form
4x + 2y = 20 2y = -4x + 20 y = -2x + 10.......but you may also write it as y = 10 - 2x.
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