Solve for x and y: Calculating Equations with Unknown Variables

[rabihtawil]

Homework Statement

i have the answer for this i just don't know how it happened
Issue1:
2x+y+3=0
x= -3

Issue2:
x+2y-3=0
y=3

Homework Equations

How did they come up with this solution?

The Attempt at a Solution

I reread it & try to solve it no luck :(

 

[rabihtawil]

oh never mind i figured it out, it's a system of linear equation

2 1 3
1 2 -3

solve the system the above results will come up. thank you forum

 

[Mentallic]

You know how to solve matrices but not a system of 2 linear equations in 2 variables?
You have essentially started with the harder stuff and skipped the easier ones

 

[rabihtawil]

My math skills are bad, I'm just working hard to pass these classes because I'm a computer science student. i finished all my major except 3 math courses which i am having the worst experience of my life in.

 

[Mark44]

oh never mind i figured it out, it's a system of linear equation

2 1 3
1 2 -3

solve the system the above results will come up. thank you forum

If you're working with an augment matix, it should be

[2 1 | -3]
[1 2 | 3]

The rows in this matrix come from these equations:
2x + y = -3
x + 2y = 3