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y = -4x-1
atau
4x+y+1 = 0
a = 4 dan b = 1
gradien sejajar :
m = -a/b = -4/1 = -4
maka,
pers.grs.melalui ttk.(-2,-1) dan m = -4 :
y-y1 = m(x-x1)
y-(-1) = -4(x-(-2))
y+1 = -4(x+2)
y+1 = -4x-8
4x+y+1+8 = 0
4x+y+9 = 0
atau
4x+y = -9
pers garis: y-y₁ = m(x-x₁)
y+1 = -4.(x+2)
y = -4x - 9
2. tegak lurus 3y= -3x - 4 dan melewati (0,3), m= -1/(-3/3)
pers garis: y-y₁ = m(x-x₁)
y-3 = 1.(x-0)
y = x + 3
3. sejajar 2y= 6x + 3 dan melewati (1,-3), m= (6/2)
pers garis: y-y₁ = m(x-x₁)
y+3 = 3.(x-1)
y = 3x - 6