Question

14. Your weight lifting class cost you a $20 fee up front and $5.50 per class after. Write the linear equation for this problem in y=mx+b form.

Answer 1

y = 5.5x + 20

Answer 2

the rate of change of price per additional class is $5.50. the initial price is $20.
so with no additional classes it's $20
so for the first additional class it's $20 + $5.5
second additional class it's $20 + 2 * $5.5
and so on
this means the equation for the total cost y for x additional classes is:
y = 20 + 5.5x