A^2+3b÷c-2d
a=3 b=8 c=2 d=5

9 is the answer to this question.

Step-by-step explanation:

a^2+3b÷c-2d

3^2+3x8÷2-2x5

9+24÷2-2-10

9+12-2-10

21-2-10

19-10

9

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