There is no single solution to that equation, as it does not represent a single value, but a relationship between the variables x and y. There are different things you can do with it though, depending on what the question relating to it would be.
For example:
Solve for x:
9y - x - 8 = 0
-x = -9y + 8
x = 9y + 8
Solve for y:
9y - x - 8 = 0
9y = x + 8
y = (x + 8) / 9
Find it's rate of change on the x axis with respect to it's rate of change on the y axis:
dx/dy = 9
Find it's rate of change on the x axis with respect to it's rate of change on the y axis:
dy/dx = 1/9
Find it's indefinite integral with respect to x:
∫((x + 8) / 9)dx
= ∫(x/9 + 8/9)dx
= x2/18 + 8x/9 + C
Several more things, but if that doesn't cover what you're looking for, you'll need to be a little more specific in your question.
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.