Question

Solve the system by graphing.
x + y = 4
–x + y = 2

confused where do i start do i need to solve for x and find points

I'll bet that after doing a few like this you would be able to do this one in your head.

just add then up. The x's will cancel and you will have 2y = 6
so dividing by 2 gives y = 3

so mentally replace the y with 3 in the first equation and you are left with

x + 3 = 4
using just good ol' common sense will give you x = 1