exam Maths Puzzle Numerical Ability

use elimination to solve each system of equations

2/3x-1/2y=14
5/6x-1/2y=18

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exam Other Question

Plwase help, I am to simplify and all exponents should be positive

Thanks, Lackinmath

(3x4y^3-5y)-(2x+3y^3-5y) Can you help me with two problems? Thank you.
I think I know how but not really sure.

the data shows answers to a survey of " how many siblings do you have?"
organize and pl