The solution of the system of equations is (3, -4).
How to solve the system of equations?
Here we want to solve the system of equations:
x - y = 7
x + y = -1
To solve it graphically, we just need to graph both lines in the same coordinate axis.
The lines can be rewriten as:
y = x - 7
y = -x - 1
So it is easier to graph them.
Once you graph them, you need to find the point where the lines intercept, that will be the solution of the system.
Below you can see the graph of the system, there you can see that the lines intercept at (3, -4), that is the solution.