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144-4x=112 she missed 8 questions

Step-by-step explanation: Since there are 144 points in total and each question is worth four points you would subtract 4x with x being the number of questions missed from the total amount and set it equal to 112. Then you solve for x which gives you 8. Hope this helps. :)

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

step-by-step explanation:

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