Question 48131
1)4x-7y=3 
2)x=2/3y + 4 

use the result of 2) in 1)
{{{4*(2/3y + 4)-7y=3}}}
{{{8/3y+16-7y=3}}}
{{{13=13/3y}}}
{{{y=3}}}
{{{x=2/3*3+4=6}}}