Part A- Which expression can be used for the missing side length of the rectangle? (See picture)

A. x√6
B. 2x
C. x√30
D. 2x√15

Part B-

Find the length of the missing side when x = 3. Round answer to the nearest tenth.

Length = N

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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