Functions A and B give the population of City A and City B, respectively, t years since 1990. In each function, population is measured in millions Here are the graphs of the two functions.
8
7
City A
6
population (millions)
NA
City B
16
1 2 3 4 5 6 7 8 9 10 11 12
time (years)
Which function value is greater: A(4) or B (4)?
O A(4)
OB(4)

you answer is a

step-by-step explanation:

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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