book Maths Puzzle Numerical Ability

hi i'm having trouble with these questions...actually with this whole subject in general

Identify the vertex of the parabola:

y^2 + 4y - x = 6

Find the center of the elli

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book Other Question

The Slope of a line through the point (1,3) is 1.5. If the point (-3,y) lies on the line, find the value of y. The question out of my book states: Find the quotients

(-3ab^2) Divided by (-9ab^2-6a^3b^3)

I divided -3ab^2 by -9ab^2 and -6a^3b^3 and I got =3ab + 2a^