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syarat tegak lurus => m2 = -1/m1 = -1 per -15/10 = -1 x -10/15 = 10/15
y-y1=m(x-x1)
y-8=10/15(x-(-6))
y-8=10/15x60x/15 per 15
15y-120=10x60
15y10x=60+120
15y-10x=180
15y-10x-180=0
kaya gitu klo gak slah