persamaan garis bergradien -5 dan melalui titik (2,-3) adalah
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y + 3 = -5x + 2
5x + y = 2 - 3
5x + y = -1
gradien (m) = -5
Dengan menggunakan rumus y - y1 = m(x - x1)
Maka :
y - y1 = m(x - x1)
y - (-3) = -5(x - 2)
y + 3 = -5x + 10
y = -5x + 10 - 3
y = -5x + 7