exam Maths Puzzle Numerical Ability

Could you please help me solve this problem? It is:
4sin2x - sinx = 0

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exam Other Question

I hope this is posted in the correct place. I need some help I do not understand how to do this. Thanks for any help you can give.
solve by elimination process and type an ordered pair.
4x - 9y = 14.5
7y - 2x = -8.5 one person proofreads a copy for a small newspaper in 4 hours. If a second proofreader is also emplyoed, the job can be done in 2.5 hours. how long does it take for the 2nd proofreader to do the job alone.