exam Maths Puzzle Numerical Ability

graph the equation on a grid 2y-3x=6

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Hi, I am studying for a test, and have no idea where to go with this problem, and I know there will be one like it on the test. I would appreciate any help.
Find all the real solu OK I lied I have one more that i dont understand.

-12 divided by 0 -12/0

Would this simply be undefined?? Maybe?