Book Maths Puzzle Co-ordinate geometry

I don't understand how to graph this equation--
y=-3xsquared
&
y=-5xsquared + 10

I know how to get the x-coordinate, but not the y-coordinate,

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Book Other Question

Vincent can read five pages in 15 minute. Which proportion can be used to figure out how long it will take him to read a 23-page pamphlet?
15 to 5 = 23 to X
5 to X = 15 t Four times the sum of two consecutive integers is equal to 2 more than 14 times the larger integer. Find the integers.