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m₁ = -6/12
m₁ = -1/2
garis kedua sejajar garis pertama berarti
m₂ = m₁ = -1/2
persamaan garis melalui (6,-3) dengan m = -1/2
y - y₁ = m(x - x₁)
y-(-3) = -1/2 (x - 6)
y + 3 = -1/2 (x - 6) (angka 2 pindah ruas)
2(y+3)= -1(x-6)
2y + 6 = -x + 6
x + 2y = 6 - 6
x + 2y = 0
persamaan garisnya x + 2y = 0
12y=-6x+8
y=-6/12x+8/12
y=-1/2x+2/3
maka m=-1/2
karena sejajar maka m1=m2
m1=m2=-1/2
sehingga persamaan garisnya
y=mx+c
-3=-1/2.6+c
-3=-3+c
c=0
jadi, y=-1/2x