Shreya rented a bike from Natalie's Bikes. It cost $10 plus $6 per hour. If Shreya paid $40, then she rented the bike for how many hours?

5 hours

Step-by-step explanation:

This is a tricky question. So first you have to pay $10. Then you can pay $6 an hour. If you think about it, if she rented the bike for 5 hours, (6 x 5 = 30) and paid $10 before she rented the bike, the bill would be $40.

Hope this helped!

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18