exam Maths Puzzle Numerical Ability

solve system by substitution

4x-12y= 5
-x+ 3y=-1

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exam Other Question

please help to solve

x + 3y = 7
xy = 2 How do you solve?

11 - 5log3 (x - 5) = 6

log x = 1 - log(x + 3)

and

e^6^y = 25

Thanks in advanced.