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= -2/ -4
= 1/2
m2 = -2 (tegak lurus)
A . m = -2/1 = -2
B . m = -2/-1= 2
C . m = -1/2 = -1/2
D . m = -1/-2 = 1/2
Jawaban A
20) titik digaris l =(0,-3) (-4,0)
m = 0-(-3)/-4-0
= 3/-4
titik digaris l=(0,5)
Persamaan garis l = y - 5 = -3/4 (x-0) x 4
4y - 20= -3(x)
4y-20 = -3x
4y+3x = 20 C