Question 120017
I bet you are trying to find the value of x and y.


we know that y=9-x 
but,
x-y=7
so,

x-(9-x)=7
x-9+x=7
x+x-9=7
2x-9=7
2x-9+9=7+9
2x=16
x=8

Solving for y,

y=9-8=1


Thus, the equations are true if and only if x=8 and y=1


Power up,
HyperBrain!