exam Maths Puzzle Numerical Ability

x-5y = 2
11x+13y=22

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Please show me how to find the least common denominator on my homework question. thank you

t^27t+12, t^2-4t, t.

The choices are. what is the answer and how do I go about fi write the equation of the line parallel to the y-axis that passes thru 2,5