exam Maths Puzzle Numerical Ability

Can you verify my answer thank you

Solve for y.
x + 3y = 6
3x=6+2y
x=6+2y/3

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exam Other Question

P=44 units,x+6 (side) x+6 (bottom)

This is my Square Equation

Any help would be greatly appreciated:) Simplify (4x^2+6x+7)+(2x^2-9x+1)