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y -y1 = m (x -x1)
y -4 = 3 ( x - (-2)
y - 4 = 3 ( x + 2)
y - 4 = 3x + 6
y = 3x + 6 + 4
y = 3x + 10
jawaban soal B
y -y1 = m (x -x1)
y - 1 = -5/8 ( x -2)
y - 1 = -5/8x + 5/4 ------> sederhanakan x 8
8y -8 = -5x + 10
8y = -5x + 10 + 8
8y = -5x + 18