Persamaan garis melalui titik a(0,5)dgn gradien m:-2

y - y1 = m (x - x1)
y - 5 = -2 (x - 0)
y - 5 = -2x
y = -2x + 5

y-y1=m (x-x1)
y-5=-2 (×-0)
y-5=-2×+0
-2×+0=y-5
-2×-y=--5-0
2×+y=5
koment aja kalau nggak ngerti
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