# How do you solve by substitution #x - 4y = -1 # and #3x + 5y = 31#?

##### 1 Answer

#### Answer:

#### Explanation:

We are given:

and

We can do this a number of ways, but let's start with

Let's multiply

Now, let's add

Now, divide both sides by

Now, just plug in the value for

subtract both sides by

divide both sides by

So,

To check if our answers are correct, you can take either of the two given equations and plug in the values of

Let's try this with