r=0 is the solution...
m = 0
Yes, it is the only solution.
Yes.
a = [ 0, 4 ]
root
The two equations are linear.
2*8 - 4*4 = 0, otherwise insert "does not" before equals.
-2
The only solution to this is x=0.
one
When you get an answer like 0=6 it would be no solution.