Hello mr_motivatorIf, when you're solving simultaneous equations, there's an infinite number of solutions, then the equations are not independent. In the case of 2 equations in 2 unknowns, this simply means that one equation is a multiple of the other. So here, , and both sides of the second equation are clearly twice the first.
When , any value of will do to find a corresponding value of .
E.g.
Grandad
PS Beaten to it again!