exam Maths Puzzle Numerical Ability

Square root sign m and right beside it they have square root sign m^2

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exam Other Question

solve the system by additio or substitution
3x+6y=0
x= 2/3

I have no idea how to work this problem with a fraction. Please help. Given: AB is equal to BC: D is the midpoint of segment AC PROVE: triangle ABD is equal to triangle CBD