So for this answer I got 5 hrs. > 38.13 - 12 = 26.13/4.75 = 5 (rounded). However, my answer is wrong. Not sure how else I can solve this. Please help!

4.75h + 12 = 38.13

h = 5.5

key takeaways : "per hour" suggests a variable rate like a slope.

                           "costs $12 for the helmet" is a constant. It will always cost $12

think y = mx + b

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.