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m2=-2
y-5= -2(x-2)
y-5= -2x + 4
y+2x-5-4=0
y + 2x - 9=0
m1 = 1/2
m2 = -2 melalui (2,5)
pers grs :
y -y1 =m(x -x1)
y - 5 = -2(x -2)
y -5 = -2x + 4
2x +y -5 -4 =0
2x + y -9 = 0