Question 29335
x=4y    ----(1)
y=3x+1   ----(2)
Using (1) in (2)
y = 3X(4y) +1
y=12y+1
y-12y = 1
-11y = 1
y =1/(-11)
That is y =(-1/11)
Putting y = (-1/11) in (1),we get 
x = 4 y = 4X(-1/11) = -4/11
Answer: x = (-4/11) and  y = (-1/11)
Verification: RHS of (2) is 
3x+1 = 3X(-4/11) +1 = -12/11+1 = (-12+11)/11 = (-1/11)= y = LHS.