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Verified answer
1) m = 12-8 / 6-4= 4/2
= 2
2) m = -6-9 / -1-2
= -15/ -3
= 5
y-b = m (x-a)
y-9 = 5 (x-2)
= 5x-10
y = 5x-10+9
y = 5x-1 atau
5x-y-1 =0 atau
-5x+y+1 =0
-
gradien 2 dan persamaan garis y = 5x - 1