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9 = 4/5 (4) + c
9 = 16/5 + c
c = 9 - 16/5
c = 45/5 - 16/5
c = 29/5
y = mx + c
y = 4/5 x + 29/5
5y = 4x + 5
atau
5y - 4x - 5 = 0
y - y1 = m(x-x1)
y - 9 = 4/5(x - 4)
y - 9 = 4/5x - 16/5y
5(y-9) = 4x - 16
5y - 45 = 4x - 16
4x - 5y - 16 + 45 = 0
4x - 5y + 29 = 0 atau
4x - 5y = -29