-5x + 13 = -12
-5x = -12 - 13 = -25
x = -25/-5 = 5
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x=6
7
(1) 5x+y=-12 (2) 7x-3y=-30 From (1) one gets y = -12-5x Put into (2) 7x-3y = 7x -3 (-12-5x) = 7x + 36 +15 x = 22x +36=-30 22x = -30-36 = -66 so x = -3 and y=-12-5x = -12-5x-3= 3 The solution is (-3,3)
5x+3y
5x = 4x + 9 x = 9