Question

22

Question 6 Multiple Choice Worth 1 points)
(04.02 LC)
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
O-2y + 10
O 2y + 10
O 2y - 10
O-2y - 10

Answer 1

-2y + 10

Explanation:

Substitution method:

On the second equation of the system, we have to find x as a function of y.

-x - 2y = -10

We have to find x as a function of y, so:

`-x = -10 + 2y`

Multiplying both sides of the equality by -1:

`x = -2y + 10`

So -2y + 10 is the answer to this question.