Question

Simultaneous equations.
x+3y=6
x-y=2

No graphs.
I solved Y by this:
simplifying x+3y=6
X=6-3y
inserting it into the other equation:
1(6-3y)+y=2
6-4y=2
6-2=4y
y=1

But I need to find x.
The answer is suppose to be (x,y)--> (3,1)

Thank you.

Answer 1

You made a mistake when you tried to find y.
It should be:
1(6-3y)-y=2
6-4y=2
-4y=-4
y=1
substitute y=1 into x-y=2
you get:
x-1=2
x=3

so (3,1)

Answer 2

Ohh, I see. Then it makes sense. All because of the ''positive'' sign :-)
Thank you, now I'll be able to solve them without any problem :-D