solve for y in equation 1
x+y=7
y= 7-x
Then plug in y = 7x into second equation
7x+2x=6
9x=6
x=6/9
x=2/3
Now you know x. To find y, plug x into first equation
2/3 + y = 7
y = 7- 2/3
y = 19/3
