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tegak lurus
m1 = -3/2
m1.m2 = -1
-3/2.m2 = -1
m2 = 2/3
y-y1 = m(x-x1)
y-(-1)= 2/3(x-2)
y+1 = 2/3x - 4/3
y = (2/3) x -7/3
3y=2x-7
2x-3y-7 =0----> jawaban