book Maths Puzzle Numerical Ability

Sorry if the subject is wrong!

My question is:

3x-y= -3/2
4x+y=5

My work:

4x+y=5
-4x -4x

From there I get really confused! Thanks for the help!

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book Other Question

Write an equation in slope intercept form of the line that passes through (2,-5) with the slope of -2. what is an angle more than 180 degrees and less than 360 degrees