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y-y₁= m (x-x₁)
y-5 = 1/2(x-2)
y-5 = 1/2x-1
1/2x-y-1+5 = 0
______________ x2
x-2y-2+10 = 0
x-2y+8=0
2x + y + 5 = 0
y = -2x - 5
gradiennya -2
persamaan garis:
y - y1 = m (x - x1)
y - 5 = -2 (x - 2)
y - 5 = -2x + 4
y = 2x + 9