exam Maths Puzzle Numerical Ability

Please help me understand this problem


Solve and write interval notation for the solution set


2x-3 less than or equal to -5 or 2x+1 greater than or equal to 2

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exam Other Question
Determine the equation of the line that contains the points (-5,6) and (9,6)

Please help!!!!!!
I totally do not understand how to even begin to solve this one!
Thank you,

Laura an airplane took 2hours to fly 600km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of th e plane in still air.