A, B and C are sets then
show that (A-B)-(B-C)=(A-B).

Correct

Step-by-step explanation:

Because you subtract A and B and B and C so there is not leftover and B is the most common set letter. So you put A minus B.

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