Ben got a part-time job. His mom said he must save at least two-thirds of his weekly paycheck, and can spend the rest. If he wishes to spend $40 this week, how much must he make?

120

Step-by-step explanation:

1/3 = 40

3/3= 40 x3

    =120

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

600,000,000,000, or 6e14

step-by-step explanation: