# How do you solve by substitution #x-y=-4# and #x+3y=4#?

##### 2 Answers

The solution for the system of equations is

#### Explanation:

**Substituting** equation

Substituting

#### Explanation:

Given:

[1]

[2]

We can rewrite [1] as

[3]

then substituting the expression

[4]

which simplifies as

[5]

or

[6]

substituting

[7]

[8]