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

a) 3(3y + 4) + 2y = -21
b) 3(-3y + 4) + 2y = -21
c) 3x + 2(3y + 4) = -21
d) 3x + 2(-3y + 4) = -21

Answer 2

A

Answer 3

is it really a? you said a for the last 2 answers

Answer 4

yes