If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalen
t to x from the second equation is substituted into the first equation.
3x + 2y = −21
x − 3y = 4
A. 3(3y + 4) + 2y = −21
B. 3(−3y + 4) + 2y = −21
C. 3x + 2(3y + 4) = −21
D. 3x + 2(−3y + 4) = −21
1 answer:
Answer:
B
Step-by-step explanation:
when you subtact 3y on both sides
you get x = -3y+4
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