Let:
[tex]\begin{gathered} (x1,y1)=(1,-1) \\ (x2,y2)=(3,1) \end{gathered}[/tex]
The slope m is given by:
[tex]m=\frac{y2-y1}{x2-x1}=\frac{1-(-1)}{3-1}=\frac{2}{2}=1[/tex]
Using the point-slope equation:
[tex]\begin{gathered} y-y1=m(x-x1) \\ y-(-1)=1(x-1) \\ y+1=x-1 \\ y=x-1-1 \\ y=x-2 \end{gathered}[/tex]
Answer:
A
