Question

Need help with math question

Answer 1

B

Explanation:

Substitute a point in the equation:

(2,3)

(3 - 3)^2 = 20(2 - 2)

(3-3)^2 = 0

Which is True

You could also use y-y1=m(x-x1)

Answer 2

B.

Explanation:

The parabola opens to the right since the focus is to the right of the vertex. So the square part will definitely contain a y. By elimination the answers can't be A or C. The vertex is (2,3) so the answer is B.

Longer answer:

formula to use is (y-k)^2=4p(x-h) where the vertex is (h,k)

So (2,3) is our vertex so enter it in giving

(y-3)^2=4p(x-2)

p is 5 since 2 and 7 are 5 units apart

p is positive because again focus is right of vertex

the answer is

(y-3)^2=20(x-2)