How do check the graph of a function has an infinite discontinuity at a point or not? (without the help of a graphing calculator)

example: Check whether y = (x^2-9)/(3x-9) has an infinite discontinuity at x = 3 or not

CAn you get rid of the denominator?

(x+3)(x-3)/3(x-3) in the limit at x=3, this becomes 2.

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