Book Maths Puzzle Permutation and Combination

1) Sue is both the 50th best & the 50th worst student at her school. How many students attend her school ?

2) In a race from point X to point Y & back, Jack averages 30 miles per hour to
point Y & 10 miles per hour back to point X. Sandy averages 20 miles per hour in both directions. Between Jack & Sandy, who finished first ?

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Book Other Question
How do you graph linear systems such as -x+y=-2 and 2x+y=10 on the same graph? how do I solve this:



Equation for verticle line passing through (8,-4)