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ini rumusnya
y-y1 = m (x-x1)
-5y = -2x + 8
y = 2/5x + 8
m1 = 2/5
m2 = m1 = 2/5
y-y1 = m2(x-x1)
y-2 = 2/5(x-7)
y-2 = 2/5x-2,8
y = 2/5x-2,8+2
y = 2/5x-0,8