Mathematics
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OpenStudy (anonymous):
The preimage of C'(-3,-10) use the translation (x,y)(x-8,y+4)
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jimthompson5910 (jim_thompson5910):
They want to know a point, call it C, where you apply the translation rule to point C to get C'
jimthompson5910 (jim_thompson5910):
So you're going from C(x,y) to C'(-3,-10)
jimthompson5910 (jim_thompson5910):
using the rule (x,y) --> (x-8, y+4)
OpenStudy (anonymous):
yes
jimthompson5910 (jim_thompson5910):
Do you see what to do to find C(x,y) ?
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OpenStudy (anonymous):
Plug in (-3,-10) ?
jimthompson5910 (jim_thompson5910):
into what?
OpenStudy (anonymous):
(x-8,y+4) ?
jimthompson5910 (jim_thompson5910):
that will apply the rule to C' to get C''
but we want to undo that rule to go back to C
jimthompson5910 (jim_thompson5910):
you just need to solve these two equations
x-3 = -8
y+4 = -10
the (x,y) pair you get will be the point C
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OpenStudy (anonymous):
I keep getting -5,-14 but the answer is 5,-14
jimthompson5910 (jim_thompson5910):
x-3 = -8
x-3+3 = -8+3
x+0 = -5
x = -5
jimthompson5910 (jim_thompson5910):
So it should be (-5,-14)
jimthompson5910 (jim_thompson5910):
oh wait
jimthompson5910 (jim_thompson5910):
nvm
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jimthompson5910 (jim_thompson5910):
I wrote down the equation wrong
jimthompson5910 (jim_thompson5910):
it should be
x-8 = -3
x-8+8 = -3+8
x+0 = 5
x = 5
OpenStudy (anonymous):
okay thank you
jimthompson5910 (jim_thompson5910):
you're welcome