exam Maths Puzzle Numerical Ability

Solve for x and y:5m+n=8 3m-4n=14

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exam Other Question

Thank you guys in advance your help is very much appreciated. I stumped on how to figure out the linear functun on this problem. Also I think I answered the rest of the problem cou Determine how far electricity travels in 7 ms. Express your answer in miles.

PLEASE help me with this.