Question

When solving this system of equations using linear combination, what should you do FIRST?

{−x+y=−11

{2x+y=19



A) Solve the first equation for y.



B) Multiply the first equation by -1.



C) Multiply the first equation by -2.



D) Add the two equations together.

Answer 1

Multiply the first equation by -1

Explanation:

Here, we ware being asked the step to take to solve the simultaneous equation

What is right here is to multiply the first equation by -1

By multiplying the first equation by -1, we will have it that the value of y in that equation becomes negative

It is from here we can now add both equations together to have only real x terms