book Maths Puzzle Numerical Ability

Complete the ordered pair to make a solution to the given equation (-7/2, ?); the equation is
-2x+3y=25

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book Other Question

(-3xy^-9)^-2/(xy^-7)^-2

Simplify the expression using positive exponents only. A boat can travel on a river 7 miles upstream in the same time it takes to travel 9 miles downstream. Find the speed of the current if the speed of the boat in still water is 8 miles per hour.