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?

3x + y = 8
−x − 2y = −10

A.-2y+10
B. 2y+10
C. 2y-10
D.-2y-10

Answer 1

To use the Substitution Method on the given system of equations, you isolate x in the second equation, resulting in x = 2y + 10, which is then substituted into the first equation. B. 2y+10

Step-by-step explanation:

The objective is to use the Substitution Method to solve the system of linear equations.

Isolating x in the second equation (−x − 2y = −10) to use in the first equation (3x + y = 8), you get x = 2y + 10. So, the expression you would substitute into the first equation for x is 2y + 10.