Question 848246
Thinking about the given points and what they are, this parabola opens to the left.  The form of the equation can be shown as {{{x=a(y-k)^2+h}}}, with vertex (h,k) and {{{a<0}}}.


According to the standard form and knowing the vertex, the equation progresses to {{{x=a(y-0)^2+7}}}, which is {{{highlight_green(x=ay^2+7)}}}.


Can you take this solution the rest of the way, yourself?