Question 165748
when you visit this station it costs $1.50 to drive in whether you buy gas or not and the price is constant at $2.75/gal...so $1.50 is a constant and $2.75 is a constant....what changes the amount of gas you pump which we will call x.  we will call what you spend at the station s.

so when you drive in you have 1.50+2.75(x)=s  that would be the linear equation where x and s are unknowns without more information.