Nan rode the roller coaster eight times which was twice as many times as she rode the Ferris wheel. What is the equation

Lets call the roller coaster "y"

and the Farris wheel "x"

Nan rode y 8 times

8y

You know that 8y is going to be twice as many as the x

8y=2x

You should always try to get the y by itself on one side of the equation. You can do this by dividing everything by 8

y=1/4x

Now your equation is compleate