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7x = 5+5x 7x-5x = 5 2x = 5 x = 2.5
(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-8 + 7x 12x-8 12x = 8 x = 8/12 x= 2/3
x=6
5x - 3y -7x + 2y +3x = (5-7+3)x + (-3+2)y = x - y