Question

graph parabola vertex: (0,0) point (-3,3)
and written in quadratic equation form

Answer 1

since the vertex is \((0,0)\) you know it looks like
\[y=ax^2\] the only thing you don't know immediately is \(a\)

Answer 2

but since \((-3,3)\) is on the graph you know
\[3=a(-3)^2=9a\] and so you can solve for \(a\) in one step