x=1st y=2nd
x+2y=13 2x+y=14
First set one of the equations equal to x or y
x=13-2y now plug this in the other equation for x
2(13-2y)+y=14 distribute
26-4y+y=14 -->26-3y=14
get the y alone
-3y=14-26 --> -3y=-12
divide by -3 on both sides
y=4
now plug 4 into one of the original equations to find x
x+2(4)=13 -->x+8=13 --> x=13-8
x=5
