Question

What is the scale factor used to create the dilation from Pre-image BCDE to image B'C'D'E' ?

A) 2

B) -2

C) .5

D) - .5

Answer 1

The first thing we are going to do in this case is to choose a vertex of BCDE.
We have then:
B = (1, 1)
We choose now the same vertices of B'C'D'E '
B '= (2, 2)
We then have the following equation:
B '= k * B
Substituting:
(2, 2) = k * (1, 1)
Where do we get the equation:
1 * k = 2
Where we conclude:
k = 2
Answer:
the scale factor used to create the dilation from Pre-image BCDE to image B'C'D'E 'is:
A) 2