book Maths Puzzle Numerical Ability

How do you multiply linear equations: 3x+2y=15 by -3x+y=-6?

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book Other Question

John and Harvey sold widgets, Harvey sold 2 1/2 times as many widgets as John. If the difference in their sales was 87 units. How many widgets did each of them sell? i have to create a box and whisker plot for the following data:

14,15,11,10,25,20,23,22,19,20

what is the lower quartile, upper quartile, and median for this set of data?