The endpoints of AB are A(9, 4) and B(5, –4). The endpoints of its image after a dilation are A'(6, 3) and B'(3, –3). Explain how to find the scale factor.

Question

The endpoints of AB are A(9, 4) and B(5, –4).  The endpoints of its image after a dilation are A'(6, 3) and B'(3, –3). Explain how to find the scale factor.

ddcamp · Answer

$$Scale\ factor = \frac{ old\ length }{ new\ length }$$

anonymous · Answer

A(9, 4)      B(5, –4)
A'(6, 3)     B'(3, –3)
----------------
   3,1           2,-1 
   1/3          -1/2 ...Like that?

ddcamp · Answer

No. Use the distance formula to find the lengths of AB and A'B'

anonymous · Answer

O thanks, got it.