How do I find the value of 2 variables when 2 simultaneous equations have no real solutions?

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I have been struggling with this question for a while now which says if these 2 simultaneous equations $ax-3y=b-3$ and $3x+y(a+8)=-b$ have no real solution, then what's the value of a and b. I have tried using matrices but with no result. Say I was able to find the a value, how do I use it to find b?