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y = 2x -6
maka, m = 2
y -y₁ = m(x -x₁)
y -3 = 2(x -(-2))
y -3 = 2x +4
y = 2x +4 +3
y = 2x +7
garis yang sejajar, maka gradiennya sama (m=2)
y-y1=m(x-x1)
y-3=2(x+2)
y-3=2x+4
y=2x+4+3
y=2x+7