exam Maths Puzzle Numerical Ability

The difference between twice a number and 9 is 16.Find the number?

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exam Other Question

find the value for m and b in the following system so that the solution to the sysytem is (-3, 4)
5x+7y =b

and

mx+y = 22

thank you for the help
find the slope of any line parallel to the line through points (18,4) and (3,5)