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

how would i solve this problem and graph it here is the problem
y=3halfx-1
y=-x+4
you half to gr
1. 2(6k-1)=-38

2. 7w-3(4w+8)=11