Question

How do you solve the system `x+y=3, x-y=-1` by graphing?

Answer 1

The answer is `x=1` and `y=2`

Explanation:

First draw the line `y=3-x`
the draw `y=x+1`
The point of intersection (1,2) is the sotion of the simutaneous equations.

graph{(y+x-3)(y-x-1)=0 [-10, 10, -5, 5]}