Question

-4x-2y=20
2x+y=19

this is a systems using elimination

Answer 1

Do you know how to do elimination?

Answer 2

kind of we have been learning it for only like 2 days

Answer 3

Have you guys gone over one solution, infinite solutions, and no solutions?

Answer 4

yes

Answer 5

Good, I'll show you why I asked that

Answer 6

First step to elimination, is cancelling out one variable. The first thing I see is -4x and 2x, which is perfect. Our negative is already lined up.

\[-4x - 2y = 20\]

\[2x + y = 19\]

Multiply the second equation by 2

\[-4x - 2y = 20\]

\[4x + 2y = 38\]

Add the two equations

Both x and y cancel

\[0 = 58\]

Answer 7

give me a little bit to figure this out

Answer 8

What part are you confused on?

Answer 9

im not really confused its just a lot of numbers

Answer 10

and we really never learned to multiply the equations ?

Answer 11

Do you understand why we're allowed to multiply the equations?