If you want this in the form y=mx+c so that you can draw a straight-line graph,
12x + 4y-20 = 4
4y=-12x+24
/4: y=-3x+6
gradient is 3, y intercept at x=6
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9x + 2 = 12x + 14 -3x = 12 x = -4
12x - 8 = 10x + 42x = 12x = 6
8x-3+6x-1 = 12x+614x-4 = 12x+614x-12x = 6+42x = 10x = 5
x2 + 12x - 64 = 0 ∴ (x + 16)(x - 4) = 0 ∴ x ∈ {4, -16}
It is: 122-4*(9*-2) = 216