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-5y = -1 - 2x
5y = 1 + 2x
y = 1/5 + 2/5 x
berarti, gradien = 2/5
y - y1 = m(x - x1)
y - 2 = 2/5 (x - (-5))
y - 2 = 2/5x + 2 (semua dikali 5)
5y - 10 = 2x + 10
5y = 2x + 20
y = 2/5 x + 4