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Caranya make rumus yang
y-y1/y2-y1=x-x1/x2-x1
x1=1
x2=-2
y1=-5
y2=4
m = 9 / - 3
m = - 3
y - 4 = - 3.(x + 2)
y = - 3x - 6 + 4
y = - 3x - 2