exam Maths Puzzle Numerical Ability

Solve {x=8-2Y amd 8y+3=6x

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exam Other Question

Given m of angle ABC = m of angle DEF
and m of angle 1 = m of angle 4

Prove m of angle 2 = m of angle 3
Simplify: (- 2a^2b^3 )^2 / ( 2a^2b)^3