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y = 7 - 6x
______
3
y = 7/3 - 3x
m1 = 3
m2 = - (3/1) = -3/1
pers. garis yg tegak lurus trhdp pers. garis y = 7/3 - 3x
y - (-2) = -3 (x - 4)
y + 2 = -3x + 12
y = -3x + 12 - 2
y = -3x + 10