# How do you solve the system #x + y = 2# and #2x + y = -1#?

##### 2 Answers

Apr 5, 2018

#### Answer:

#### Explanation:

**from this equation**

put the value of

Apr 5, 2018

#### Answer:

#### Explanation:

This is a simultaneous equation question. In the interest of time, I will solve it using the elimination method:

To solve using elimination, all we do is literally subtract the bottom line from the top line which gets rid of the y

We then substitute (

And then check that this works, using substituting both values into the second equation.