2x + 4y = 12 ie 4y = 12 - 2x so y = 3 - x/2
Test: take x as 8 so y = -1: 2 x 8 + 4 x -1 does indeed = 12.
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x=5.54x+1= 2x+12-1 -14x=2x+11-2x -2x2x=11/2 /2x=5.5
2x + 7 = 1 Therefore, 2x = -6 x = -6/2 x = -3
-2x - 2y = -122x + 2y = 122y = 12 - 2xy = 6 - x
3x-2 = 2x+3 3x-2x = 3+2 x = 5
2x + 4 = 16 2x = 16 - 4 2x = 12 x = 12/2 x = 6