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y-y1 / y2-y1 = x-x1 / x2-x1
y-2 /0-2 = x-0 / 5-0
y-2 / -2 = x /5
5(y-2) = -2x
5y -10 = -2x
5y = -2x +10
y = -2/5 x +2
m = -2/5
c = 2