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y - 4 = (- 1/3)(x - 0)
3y - 12 = - x
x + 3y - 12 = 0
m = - 1/2
(0,4) = ( X1, Y1)
maka pers. Garisnya
y - y1 = M ( X - X1)
y - 4 = - 1/3 ( x - 0)
y - 4 = - 1/3x kalikan 3
3y - 12 = x
x - 3y + 12 = 0