Question

What is the solution to this sytem of equations?
4x+3y=12
7x+5y=26
1. (18,20)
2. (18,-20)
3. (-20,18)
4. (20,18)

Answer 1

I would multiply the first equation times 5, and second equation times -3.
Then, I would add the equations and this will help me eliminate one of the variables.

Answer 2

I got 18, -20

Answer 3

times 3
\(\color{#000000 }{ \displaystyle 4x+3x=12\quad \Longrightarrow \Longrightarrow \quad (4x\color{red}{\times 3}) +(3x\color{red}{\times 3})=(12\color{red}{\times 3}) }\)

Answer 4

Yes I got it, thank you guys!

Answer 5

For future reference you'll need to use the linear combination method to solve some systems