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m1xm2 = -1
m2 = -1/2
rumus :
y-y1 = m(x-x1)
y-7 = -1/2 (x+2)
(y-7 = -1/2x -1) x2
2y - 14 = -x -2
2y+x-12 = 0
y = -1/2x + 6
Ingat krn tegak lurus mk
M1 × M2 = - 1