Question

Question 3(Multiple Choice Worth 5 points)

(05.02)
For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation? (5 points) 3x + y = 8 −x − 2y = −10

Answer 1

First Equation

STEP 1: Move the variable to the right side and change its sign

3x=8-y

STEP 2: Divide both sides of the equation by 3

x=8/3 - y/3

STEP 3: Write all numerators above the common denominator

x=8-y/3

THE FINAL ANSWER IS:

x=8-y/3

Second Equation

STEP 1: Move variable to the right side and change its sign

-x= -10+2y

STEP 2: Change the signs on both sides of the equation

x=10-2y

THE FINAL ANSWER IS:

x=10-2y