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karena garis h tegak lurus garis PQ, maka:
m1 x m2 = -1
x m2 = -1
m2 = 2/3
jadi gradien garis h = 2/3
x1 = 4
y1 = -7
x2 = -6
y2 = 8
ditanya : gradien ?
jawab :
jadi, gradien nya yng melalui dua titik tersebut adalah - 3/2