exam Maths Puzzle Numerical Ability

Can you help me solve:

5m+n=8
3m-4n=14

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exam Other Question

Please help me to answer this question "What is x and y for the term 9x+y=10 and x+4y=5 using the substitution?" And please teach how to solve it step by step... Please... <> graph the solution set for the equation
y=-2/3x-2

i am trying to use Graph but it does not seem to be working for this problem.

please help