book Maths Puzzle Numerical Ability

CAN SOMEONE TEACH ME HOW TO DO LINEAR INEQUALITIES?
like - how do i find a boundry of a line?
ex. y>x y=____

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book Other Question

A building that is 150 ft tall casts a shadow of 20 feet long. At the same time a tree casts a shadow of 2 ft. How tall is the tree?
Working together, Joe and Jim can dig a ditch in 7 hours. Working alone, it takes Jim 2 hours longer than it takes Joe. How long will it take Joe to dig the ditch alone.

Please