# How do you solve #y=4x# and #x+y=5#?

##### 1 Answer

The common point for these two equations ( where the graphs cross) is:

#### Explanation:

Given:

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To solve for a variable your equation has to end up with just 1 of that variable and no others. That variable has to be on one side of the equals sign and everything else on the others side.

If we substitute for y in equation (2) using what y is worth from equation (1) we have just 1 variable. Which is

But

Divide both sides by 5

But

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Substitute for

In algebra

But

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Note that