Persamaan garis yang melalui titik (-4,-1)dan (-3,2) adalah

Kelas 8 Matematika
Bab Persamaan Garis

(y - y1)/(y2 - y1) = (x - x1)/(x2 - x1)
(y + 1)/(2 + 1) = (x + 4)/(-3 + 4)
(y + 1)/3 = (x + 4)/1
y + 1 = 3(x + 4)
y = 3x + 12 - 1
y = 3x + 11

( -4 , - 1 ) = ( x₁ , y₁ )
( -3 , 2 ) = ( x₂ , y₂ )

y - y₁ / y₂ - y₁ = x - x₁ / x₂ - x₁
y - (-1) / 2 - (-1) = x - (-4) / -3 - (-4)
y + 1 / 2 + 1 = x + 4 / -3 + 4
y + 1 / 3 = x + 4 / 1

( gunakan perkalian silang )

1( y + 1 ) = 3( x + 4 )
y + 1 = 3x + 12
y = 3x + 12 - 1
y = 3x + 11

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