What is a counterexample for the statement “If equals 81, then x must be 3”? A.) x must be -3
B.) x must be 2
C.) x must be -4
D.) x must be 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

your answer is -9

step-by-step explanation:

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