Help 21,22 ​

21.   

This is an ellipse....in standard form, we have

x^2   +  y^2      =     1

___     ____

  1         4

The domain  is    -1  ≤ x   ≤ 1

The range  is  -2  ≤ y  ≤ 2

22.

Vertex =  (0,0)

Focus  (-4,0)

So we have

4px = -y^2         

p  = 4.......so we have

4(4)x  = -y^2

16x  = -y^2 

x  = (-1/16)y^2