Nilsa is working on a 60-minute test. there are 20 questions on the test. if it takes her 20 minutes to complete 12 0f the questions, what is the greatest amount of time on average she can spend on each of the remaining 8 questions?

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

the ratio of balloons to tables is 5: 2 and the constant variation is 5.

the equation is y=5x