Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the second equation is substituted into the first equation.
3x + 2y = -21
x - 3y = 4

Answer 1

3x+2y=-21 ...equation 1
x-3y=4 ....equation 2
x=4+3y .....equation 3
sub equation 3 into equation 1
we get
3(4+3y) +2y = -21
........

Answer 2

can solve for the solutions from there???
@xangelaax

Answer 3

these were the options bc i solved for y

3(3y + 4) + 2y = -21

3(-3y + 4) + 2y = -21

3x + 2(3y + 4) = -21

3x + 2(-3y + 4) = -21

Answer 4

well if you look back at my previous post u will see the answer in ur options...

Answer 5

sorry thanks so much

Answer 6

now which one is it?

Answer 7

first

Answer 8

correct

Answer 9

ur welcome

Answer 10

yay thanks