exam Maths Puzzle Numerical Ability

what is algebraic expression and algerbraic equation?

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Tutor could I please get your help? My problem is: how do I simplify this expression: 3y^2+5yz+2z^2 over 2y^2+3yz+z^2

Thank you! I have just started on equation substitutions. They are very confusing, and my entire 10th grade class is struggling. can you help me solve this substitution?

4x+y=-2 2x=-y