Which expression should be used to estimate the answer to this story problem? travis planned to watch 4 dogs while his neighbors were out of town for a week. each dog would need to eat 612 ounces of dog food. how many ounces of dog food were needed for all the dogs? a. 600 + 4 b. 600 – 4 c. 600 × 4 d. 600 ÷ 4

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step-by-step explanation:

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