Answer:
The coordinates of b are (3, -5)
Step-by-step explanation:
[tex]c(1,-1)[/tex]
[tex]a(-1,3)[/tex]
[tex]1=\frac{-1+x}{2}[/tex]
[tex]2=-1+x[/tex]
[tex]x=2+1[/tex]
[tex]x=3[/tex]
[tex]-1=\frac{3+y}{2}[/tex]
[tex]-2=3+y[/tex]
[tex]y=-2-3[/tex]
[tex]y=-5[/tex]
