Question 27730
This set of equations is best solved by substitution.


We know that x=4y so we can substitute this value for x in the second equation.
y=3x+1
y=3(4y) + 1
y=12y + 1
y-12y=1
-11y=1
y=-1/11


x=4y
x=4(-1/11)
x=-4/11


Strange values.  You can substitute them into the equations to check their correctness.