Which of the following numbers are divisible by 3

If you add up all of the digits in the number, and if that number you get is able to be divided by 3, the original number is good to divide by 3.

For example: 618

You add 6+1+8 and get 15

Take 15 and divide by 3

You get a whole number, 5

Therefore, 618 can be divided by 3

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

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce