exam Maths Puzzle Numerical Ability

Is the ordered pair (1,2) a solution of the equation 4x - y = 6?

my answer is 2 = 6 (false statement)

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exam Other Question

1) 1/A=1/M+1/T solve for T
I thought my LCD was AMT but its still not coming out right.
If someone could help thanks. What is the square root of 48x^3y^2 all over the square root of 4xy^3 ?

I would really appreciate it!
thank you very much!!!!