Question

Angela is getting a pedicure at a spa that also offers massages where customers pay by the minute. If Angela only gets a pedicure, it will cost her $35. If she pays for a 20 minute massage, it will cost her $50.
Write an equation in slope-intercept form where x represents the number of minutes for a massage and y represents Angela's total cost of a pedicure and a massage.

Answer 1

This is an expression if she only gets pedicure
y = 35

If she wants to get massage, multiply the cost for a minute with the number of minutes.
Find cost per minute first
cost = 50/20
cost = 2.5

So the expression would be
y = 35 + 2.5x
y = 2.5x + 35