The following are common multiples for which pairs of numbers?

72, 108, 180

A. 3 and 8
B. 4 and 7
C. 6 and 8
D. 9 and 12

D 9 an d12

Step-by-step explanation:

D: 9 and 12

Step-by-step explanation:

The way I worked out the soultion is by seeing if they are multiples, how I did that was simply by going on to a multiples chart or calculator and seeing if 9 and 12 each had the numbers 72, 108, and 180 on them and once I did I knew that was the answer. The other answers did have at least one of the numbers as an answer but they didn't have all three, the only one that did was answer D.

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