Question

Help me please and maybe explain how you go the answer

Answer 1

Answer:

C.  x + 2y = 10

   -4x - y = 2

Step-by-step explanation:

A. quickest way is to plug in -2, 6  and see which one works

B. this is the other way

1. x + 2y = 10

-4x - y = 2

2. multiply 4 with  x + 2y = 10 so i can get 4x + 8y = 40

i want +4x so i can cancel with the -4x in  -4x - y = 2

3.

4x + 8y = 40

-4x - y = 2

--------------------

7y = 42

y = 6

4. then plug in 6 into an equation to get x

-4x - y = 2

-4x -6 = 2

-4x = 8

x = -2