tentukan persamaan garis yang melalui titiik (1,2) dan titik (3,6)

[tex]x_{1}=1; y_{1}=2 \\ x_{2}=3; y_{2}=6 \\ \\ \frac{y-y_{1}}{y_{2}-y_{1}}= \frac{x-x_{1}}{x_{2}-x_{1}} \\ \\ \frac{y-2}{6-2} = \frac{x-1}{3-1} \\ \\ \frac{y-2}{4} = \frac{x-1}{2} \\ \\ 2(y-2)=4(x-1) \\ 2y-4=4x-4 \\ 2y=4x+4-4 \\ 2y=4x+0 \\ 2y=4x \\ y=2x[/tex]