exam Maths Puzzle Numerical Ability

How do I find the slope? x=4

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exam Other Question

A drain can empty a swimming pool in 8 days. A second drain can empty the same pool in 4 days. In how much time will the two drains working together empty the pool? What do you set the equation equal to when you are looking for the measure of an angle in a circle? example: what would the angle equal if the equation was: 15x+3 would I set it equal to 360 or what or what if the equation were just 4x