Question

Which expressions are equivalent to 3(x + 3y + 2x − y )?
3(3x + 2y) and 9x + 6y
3(3x + 4y) and 9x + 12y
3(x + 4y) and 3x + 12y
3(x + 2y) and 3x + 6y

Answer 1

@Kim21 I think its the last one? not sure.

Answer 2

well first of all you would have to solve for x and then figure out the answer to 3(x + 3y + 2x − y ) in order to get your answer ;)

Answer 3

so do you know how to do that?

Answer 4

am going to do this using substitution and then by elimination.
SUBSTITUTION METHOD
Let's solve the first one in terms of y.
y = 3-x.
Plug 3-x where you see y in the second equation.
2x - 3(3-x) = 16
2x - 9 +3x = 16
5x -9 = 16
5x = 25
x = 5
Plug x=5 back into the other equation.
2(5) - 3y = 16
10 - 3y = 16
-3y = 6
y = -2
So our solution is (5,-2) or x=5y=-2

Answer 5

now solve each of the choices that they give you until you get one with the same answer :)