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*maka m nya adalah = mx/my
M1 = (2/3 : 1) ⇨2/3
*ingat, rumus gradien apabila tegak lurus. Maka m1 x m2 = -1
M1 x m2 = -1
2/3 x m2 = -1
M2 = -1 : 2/3
= -1 x 3/2
= -3/2