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4x + 3 cannot equal 4x + 12:4x + 3 = 4x + 12 (given)3 = 12 (subtract 4x from both sides)
4x+6=6x-12
8x + 12 = 4x - 4 8x - 4x = -4 - 12 4x = -16 x = -4
At the x-intercept, y=0 so...2y - 4x = -122(0) - 4x = -12-4x = -124x = 12x = 12/4x = 3
if 4x+1=12 4x+1-1=12-1 4x=11 4x/4=11/4 x=11/4