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misalkan gradien garisnya adalah m, agar tegak lurus, maka
m x -1/3 = -1
m = 3
y-y1 = m(x-x1)
y-10 = 3(x-4)
y-10 = 3x-12
y = 3x-12+10
y = 3x-2
m2= 3
Y-y1 = m(x-x1)
Y-10 = 3(x-4)
Y-10 = 3x - 12
Y = 3x -12 + 10
Y = 3x - 2