book Maths Puzzle Numerical Ability

a publisher printed 56 million pages in its production last year. If this represents a 112% over the number of pages printed the previous year, how many pages were printed the previous year?

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I need help finding the radius and center of a circle with the following equation x squared+ y squared + 4x + 10y + 15 = 0 thanks! For which system(s) of equation is(2,3) the solution? I know I have to put in 2 for x and 3 for y but I don't know how to do it.
1. y = 3x - 3 and y = -2x + 7
2. y = 2x - 1 and y