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Mathematics 21 Online
OpenStudy (anonymous):

Pre-image point N(6, -3) was dilated to point N'(2, -1). What was the scale factor used?

jimthompson5910 (jim_thompson5910):

hint: 6k = 2 -3k = -1 solve for k

OpenStudy (anonymous):

so you would divide it by 2

jimthompson5910 (jim_thompson5910):

6 * _____ = 2 what goes in the blank?

jimthompson5910 (jim_thompson5910):

to find out, divide both sides by 6

OpenStudy (anonymous):

so 6 off of six is 0 and six out of two would be -3 right

OpenStudy (anonymous):

what it would be 3 not -3 right?

jimthompson5910 (jim_thompson5910):

6k = 2 k = 2/6 ... divide both sides by 6 k = 1/3

OpenStudy (anonymous):

wait*

jimthompson5910 (jim_thompson5910):

so you are multiplying both parts in point N by 1/3 to get the corresponding parts in N'

OpenStudy (anonymous):

ok, so it would be 1 over 3

jimthompson5910 (jim_thompson5910):

so the scale factor is 1/3 ie everything is 1/3 as big

jimthompson5910 (jim_thompson5910):

yep

OpenStudy (anonymous):

ok, Thanks you so much!

jimthompson5910 (jim_thompson5910):

sure thing

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