Question

x+y=7
x-y=-1 I don't know how to solve and graph

Answer 1

Hi there. Care to work on this together?

Answer 2

use algebra to isolate y
x+y=7
is equal to
y=7-x

Answer 3

x-y=-1 is equal to
-y=-1-x
is equal to
y=1+x

Answer 4

x+y=7
x-y=-1---->y=x+1
substitute it
x+x+1=7
2x=6
x=3
y=1+3=4