x+4y=2(1)

x=3-4y(2)

2 answers

What are the (1) and (2) ???
ignoring them I assume you have two linear equations in x and y
rewrite these as
x + 4 y = 2
x + 4 y = 3
this set of equations is inconsistent. the same quantity can not be both 2 and 3.
In fact these are two parallel lines on a graph and never cross.
here is no solution.
4w+x+2y-3z=-16, -3w+3x-y+4z=20, -w+2x+5y+z=-4, 5w+4x+3y-z=-10