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jawab: y - 6 = 4 (x - -2)
y - 6 = 4x + 8
persamaan garis nya : -4x +y - 6 -8 =0
2. rumus : y - y1 per y1 - y2 = x - x1 per x1 - x2
jawab : y - 5 per 5-1 = x -4 per 4 - -4
y - 5 per 4 = x-4 per 8
dikali silang 8(y-5) = 4(x-4)
8y-40 = 4x -16
persamaan garis nya -4x + 8y -40 +16= 0
jadi -4x + 8y -24 =0