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- anonymous

finding missing endpoints: is there a way to do it algebraically?
http://www.youtube.com/watch?v=d51p_8xQQZ0
so you can draw a number line to see how far each number is from each other, but is there a faster way to do it?

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- anonymous

- jamiebookeater

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- anonymous

ignore this video. you can find the endpoint using algebra or just thinking. you have an actual problem to solve?

- anonymous

Endpoint: (−9, −1), midpoint: (8, 14)

- anonymous

you want algebra or think method?

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- anonymous

algebra

- anonymous

or whatever you were typing

- anonymous

we can do both
for first coordinate solve
\[\frac{x-9}{2}=8\] and for second solve
\[\frac{y-1}{2}=14\]

- anonymous

because midpoint you use
\[\frac{x_1+x_2}{2}\] for the first coordinate and
\[\frac{y_1+y_2}{2}\] for the second. so if you know the answer you can find the first or second coordinate

- anonymous

oh i see i got it right, you subtracted because they're negative?

- anonymous

thank you :'}
you're very good at math don't ever stop what you're doing

- anonymous

yes i "subtracted" because both were negative. if they had been positive i would have added.

- anonymous

thank you for the compliment

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