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y-y1/y2-y1=x-x1/x2-x1
Dik : x1=4 y1=(-3)
x2=(-2) y2=(-5)
Dit: persmaan gris lurus?
peny : gunakan rumus yang diatas
y-(-3)/-5-(-3)=x-4/-2-4
y+3/-2 = x-4/-6
-6y-18 = -2x+8 -----> di kali silang
-6y+2x-18+8 = 0
-6y+2x-10 =0 ---------> hasil persamaan garis lurus.
= -5 - (-3) / -2 -4
= -5 + 3 / -6
= -2 / -6
= 1/3
m₁ . m₂ = -1
1/3 . m₂ = -1
m₂ = -1 / 1/3
m = -3
y-1 = m(x-x₁)
y -1 = -3 (x - 4)
y -1 = -3x + 12
y = -3x + 12 +1
y = -3x + 13