What is the quotient of 12 and -1/2

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

Solve by any method (graphing, substitution or linear combination)y = x - 82x + 3y = 1a) (2, -6)b) (5, -3)c) (4, -4)d) (0, -8)i figured it out. the answer is (5, -3)

If y varies directly as x2 and y=6 when x=6, find the constant of variation.