Write an equation of the parabola with vertex (0, 0) and directrix x=2.

Step-by-step explanation:

directrix x=2 and vertex (0, 0) means focus: (-2, 0)

also means the distance from the origin to the focus: a=2

y² = -4ax  

y² = -4×2x

y² = -8x

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl