The best explanation is: If you were to follow the instructions,
then the answer would jump out at you.
The first word on the page tells you to GRAPH the equations.
You didn't do that. You read that, and you said to yourself
"Self ! You don need to do dot." so of course you're having
trouble finding the answer.
When you GRAPH the two equations, you'll find that you have
two straight lines on the graph, and they're parallel. Whatever
point you pick on the upper line, the lower line is ALWAYS exactly
9 units below it. The lines are never closer together, and they're
never farther apart. Always exactly 9 units.
The lines never cross anywhere.
A "solution" to the system is a point where the lines cross.
There isn't any.
