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tegak lurus :
m1 .m2 = -1
2.m2 = -1
m2 = - 1/2
y-y1 = m(x-x1)
y-(-3) = - 1/2(x-2)
y+ 3= - 1/2x + 1
y = - 1/2x -2
maap klo salah