Question

can someone please help me solve this question?
I tried so many times but I still could not get it...

x + y = 7
2x - y = 5

its supposed to start as
[1 1 | 7]
[2 -1 | 5].....


and the ans is supposed to be (4,3)

thanks in advance
much appreciated

Answer 1

I think its

[ 1 1 | 7]
[ 0 3 | 9] R2->2R1 - R2

0x+3y=9
y=3

Sub that into x+y=7
x+3=7
x=4

Therefore, (4,3)