book Maths Puzzle Numerical Ability

the sum of the digits of a 2 digit number is 9. if the number is doubled than decreased by by 36, the answer is the original number with the digits reversed. Find the number. You m

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please help me with this problem {3a+b+c=7
a+3b-c=13
b=2a-1 Ok can you help me with this one?
"Use the discriminant to determine whether the vertex of the graph of the function 6x^2-2x+4 below lies above, below, or on the x-axis."