Question

I think its substitution..
3x - y = 1
x + y = 7

Answer 1

Add the equations together:

3x - y + x + y = 1 + 7
4x = 8
x = 2

Now substitute x = 2 into whichever equation (2 is easier)
2 + y = 7
y = 5

So x = 2, y = 5

Answer 2

Ohkay that's what i got. ^-^ just wanted to make sure.

Answer 3

Sure thing. If you want to make sure, just substitute your x and y into both equations and see if they work

Answer 4

Oh yeah. You may want to close this question ;D