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Memotong sumbu X --> (a,0)Memotong sumbu Y ---> (0,b)
Persamaan garis yg mlalui (a,0) dan (0,b) :
bx + ay = a × b
gradien = m = -b/a
Persamaan garis dg m = -b/a dan mlalui Q(2,7) :
y - 7 = -b/a (x - 2)
3 contoh garis yg memenuhi persamaan diatas :
1) b = -4 dan a = 2
y - 7 = -(-4)/2 (x - 2)
y -7 = 2x - 4
2x - y + 3 = 0
2) b = 6 dan a = 1
y - 7 = -6(x - 2)
y - 7 = -6x + 12
-6x - y + 19 = 0
3) b = -1 dan a = 1
y - 7 = -(-1)(x - 2)
x - y + 5 = 0