Question 206288
y=x+4 
3y-5x=6 
3(x+4)-5x=6
3x+12-5x=6
-2x=6-12
-2x=-6
x=-6/-2
x=3 ans.
y=3+4
y=7 ans.
Proof:
3*7-5*3=6
21-15=6
6=6