exam Maths Puzzle Numerical Ability

This really does not portain to circles but I need to know how to find the angle of a curve. I am building a roller coaster in a class and I need to know how to find the angle of a

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Write the equation of the line with slope 5 and y intercept (0,-3)

Can someone please help me with this? what is the 10a to the second power minus 15ab / 4a to the second power minus 9b to the second power reduced in lowest terms