# Y=-x-1 y=-2x+1 ?

##### 2 Answers

Mar 9, 2018

#### Explanation:

Substitute the

Add

Subtract

Divide both sides by

Mar 9, 2018

Linear algebra states that x=2, making y=-3

#### Explanation:

Linear algebra allows us to add and subtract whole equations from each other, like so:

Taking the solution from the bit of linear algebra we've done:

We can now plug our solution for