book Maths Puzzle Numerical Ability

please help me with this problem, I am confused...

y-b=x
---
m

y minus b over m equals x

thank you
John

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book Other Question

A rectangular playground is being constructed using a barn as one side and 80 meters of fencing to form the other three sides. What is the maximum area of such an enclosure? What is the situation when two linear inequalities have no solution? And what conditions need to be satisfied for a system of linear inequalities to have its solution in the first quadrant?

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