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

y-y1 = m(x-x1)
y-(-2) = -3(x-2)
y+2 = -3x+6
y = -3x+6-2
y = -3x+4

[tex]Diketahui \ : \\ m = -3 \\ x_{1} = 2 \\ y_{1} \ = \ -2 \\\\ Jawab \\\\ y - y_{1} \ = \ m \ (x \ - \ x_{1}) \\ y \ - \ (-2) \ = \ -3 \ (x \ - \ 2 ) \\ y \ + 2 \ = \ -3x \ +\ 6 \\ y \ = \ -3x \ + \ 6 \ - \ 2 \\ y \ = \ -3x \ + \ 4 [/tex]