How do you find slope intercept of this problem? I got y=6x+15, is this right?

Question

Aminata joins a CD club. She pays $15 for the membership and $6 for each CD that she buys. Write an equation in slope-intercept form that models the relationship between the cost Aminata pays, y, and the number of CDs Aminata buys, x.

Answer 1

y = mx + b

The one time cost corresponds to b, so

b = 15

The cost of $6 per CD corresponds to the slope, so if x is the total number of CDs purchased,

m = 6

Put it all together and get total cost y as

y = 6x + 15

Your answer is correct.