Question

question 3 (multiple choice worth 6 points)(08.01r mc)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$$x - 3y = 4$$3(3y + 4) + 2y = -21$$3(-3y + 4) + 2y = -21$$3x + 2(3y + 4) = -21$$3x + 2(-3y + 4) = -21$

Explanation:

Step1: Isolate x from second equation

From $x - 3y = 4$, solve for x:
$x = 3y + 4$

Step2: Substitute x into first equation

Replace x in $3x + 2y = -21$ with $3y + 4$:
$3(3y + 4) + 2y = -21$

Answer:

A. $3(3y + 4) + 2y = -21$