Heather is a cashier. she can ring up 12 customers in 9 minutes. at this rate, how many minutes does it take her to ring up 4 customers?

9 minutes / 12 customers = 0.75 minutes per customer

4 customers x 0.75 minutes per customer = 3 minutes total for 4 customers

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation: