Question

2x + y = 4
3x - y = 6

Answer 1

y=(1/2)x-1

You have to set both to y and then add. After that you solve for y

Answer 2

so, just add

2x+y=4
3x-y=6 +
5x+0y=10

5x=10
divide 5
x=2

sub back
2x+y=4
2(2)+y=4
4+y=4
y=0

x=2
y=0
(2,0)

the result of adding the equation is 5x=10