exam Maths Puzzle Numerical Ability

A square is 5 meters longer than a side of an equilateral traiangle. The perimeter of the square is 2 times the perimeter of the equilateral triangle. Find the length of each side

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exam Other Question
26. Find values for m and b in the following system so that the solution to the system is (-3,4).

5x+7y=b
mx+y=22


Thank you for your time!!!
 how to solve using the U substitution method
(x-1/2)^2 +5(x-1/2)-4=0