exam Maths Puzzle Numerical Ability

x=2y+6
1/2x-y=3

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The speed of a boat in still water is 24mph. If the boat travels 54 miles upstream in the same time that it takes to travel 90 miles downstream, find the speed of the current. I would like to get some help on these problems. Thank you for taking the time to help me out.

Find the slope of the line passing through the points (3,4) and (3,-4)

Graph 3