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m2=2-4 : 7-0 = -4/5
keduanya tdk b'hubungan sptny
= 2 + 5 / - 1 + 3
= 7 / 2
Gradien L2 = y2 - y1 / x2 - x1
= 2 - 4 / 7 - 0
= - 2 / 7
Diketahui dari gradien kedua titik koordinat bahwa jwabannya = saling tegak lurus
karena m1.m2 = -1
7/2.-2/7 = - 1
semoga bermanfaat ;)