Question

Y=x-700
2x - y = 800

Answer 1

X=

Explanation:

first you should substitute for X

Y=X-700

2X-y=800

2X-(X-700]=800

X+700=800

X=100

then you substitute for Y

Y=100-700

Y=-600

last you put in the equations to make sure all the numbers are right.

-600=100-700 good

200--600=800 good

X=100

Y=-600