Question

How do you solve the system `x + y = 1` and `y = 3x - 19` by graphing?

Answer 1

`x=5`
`y=-4`

`(5,-4)`

Explanation:

`y=3x-19`
`y=-x+1`

the graphs are:
graph{3x-19 [-10, 10, -5, 5]}
graph{-x+1 [-10, 10, -5, 5]}

the graphs are (with "zoom in"):
graph{3x-19 [4, 6, -5, -3]}
graph{-x+1 [4, 6, -5, -3]}

you can see that when `x=5` and `y=-4` the graphs combined, and therefore this is the result of systems by graphing.