A yoga membership costs $16 and an additional $7 per class. Write a linear equation modeling the cost of a yoga membership.

y = 16x + 7
y = 7x + 16
y = 23x + 7
y = 23x + 16

Question

A yoga membership costs $16 and an additional $7 per class. Write a linear equation modeling the cost of a yoga membership.

   y = 16x + 7 
   y = 7x + 16 
   y = 23x + 7 
   y = 23x + 16

matt101 · Answer

Think of it like this: you need to pay $16 for membership regardless of what you do, so that's your minimum payment. You pay another $7 per class, so the amount extra you pay depends on the number of classes you do.

Say x is the number of classes you do and y is the total cost. The equation would therefore be: $$y = 16 + 7x$$