Question

What is the solution to this system of equations?
9x - 2y =15
4x+ 3y= -5

Answer 1

You can use this one of two ways, but I prefer substitution because I find it to be easier

Answer 2

Do you have a preferred method?

Answer 3

do you know the multiplication method?

Answer 4

There's not really a "multiplication method" -- there's substitution and the addition stuff only

Answer 5

that's what I meant...my bad

Answer 6

elimination method

Answer 7

Yeah there you go :) By the way, the best way to master something is to teach it to someone else. Give it a go!

Answer 8

I will try

Answer 9

I'll stick around to make sure everything goes smoothly :p

Answer 10

9x - 2y =15
4x + 3y = -5
I like to start by switching the first two variables around (9x and 4x)...like this
(4) 9x -2y = 15
(9) 4x + 3y = -5
now multiply all the way across

Answer 11

(4) 9x -2 =15
36 -8 60
now you try the bottom row

Answer 12

You're trying to get like terms to solve for x, I understand. It will be easier to just simplify as is because y will be by itself. Finding like terms like that will complicate it if you can already solve for y. So you should only do it if you can't just solve for a variable like this

Answer 13

I guess you could eliminate x but it still gets messy...