Acab charges $1.79 for the flat fee and $.25 for each mile right and solve an inequality to determine how many miles and you can travel if you had to spend $15

We look at 3 things...flat rate (constant) 1.79
                                   (variable)               .25x   (x represents miles)
                                (what it equals)       15.00

now we can write an equation...     1.79 + .25x ≤ 15.00