Someonefor 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

The original equation we have is : −x − 2y = −10

We need to isolate the x, which means that we need to get x alone on one side of the equation preferably in a positive form.

So, going back to the original expression:

−x − 2y = −10

To make x positive, we will add x to both sides of the equation, thus, we get:

-2y = -10 + x

The next step is to eliminate the -10 from beside the x. To do this we will add 10 to both sides of the equation. When doing this we get:

x = -2y + 10

The answer is A. -2y + 10

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.