Question

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?

2x + y = 8
−x − 3y = −12

A. 3y + 12
B. −3y + 12
C. 3y − 12
D. −3y − 12

Answer 1

Answer:

B. -3y+12.

Step-by-step explanation:

Since, -x-3y= -12.

so, by changing sides:

x= -3y+12.