Question

A gym membership is $100 sign-up fee and charges $20 a month thereafter. How much is the membership fee in a month?

Answer 1

$120

Explanation:

y = mx + b

The $100 sign up fee is a set amount, or the b value.

The $20 would be the m value since it the constant change, or the slope.

Thus, the equation would be y=20x + 100

The membership fee for 1 month would be --->

y= 20(1) +100

y= 20 + 100

y= $120