Please help me solve by substitution!?

Question

injave no idea what to do, please help me!

 

x+y=1

2x-y=2

Answer 1

Take the first equation and rearrange it by moving the 'x' to the other side of the equation.  What you will have is:

 

y=1-x

 

Take this and substitute it into the second equation for the y:

 

2x-(1-x)=2

 

Solve for x:

 

2x-1+x=2

3x-1=2

3x=3

x=1

 

Once you find 'x', you can put it into the first equation and solve for y:

 

1+y=1

y=0