# How do you solve the system #x+5y=4# and #3x+15y=-1# using substitution?

##### 1 Answer

Mar 29, 2018

Lines are parallel so no intersection.

#### Explanation:

You have to rearrange one of the equations so that it is equal to x and y and then substitute it into the other equation

eq1

Substitute the whole equation into eq2 as

Solve for y

So the lines don't cross which means they are parallel