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= -3/5
karena kedua garis tegak lurus, maka m1.m2 = -1
-3/5 , m2 = -1
m2 = -1 : -3/5
m2 = -1 x - 5/3
= 5/3
cara gampangnya : gardie kedua = gradien pertama di balik, berubah tanda
m1 = -3/5 maka m2 = 5/3 (D)
3x = -5y -20
x = -5/3 y - 20/3
jadi gradiennya -5/3 (A)