exam Maths Puzzle Numerical Ability

Find all the numbers for which the rational expression below is not defined:
x^2-16 / x^2 - 3x+12

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exam Other Question

Solve the system by graphing
2x+3y=1
5x+3y=16 Hey guys,

I really need help with them. I've been within my text, on the internet, and I can't find an example of how to do this problem.

Simplify the formula..

1