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If x + y = 10 and xy = 2, what is the value of 1/x + 1/y?

 

a) 1/5

b) 5

c) 1/10

d) 10

 Jul 29, 2020
 #1
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+1

http://www.columbia.edu/itc/sipa/math/systems_linear.html

 Jul 29, 2020
 #2
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just turn  1/x+1/y into an entire fraction and it will all fall out.

 Jul 29, 2020
 #3
avatar+206 
+1

what do you mean by turn it into an entire fraction? cross multiply it? but i thought u cant do that with them not being set qual to each other.

 Jul 29, 2020
 #4
avatar+110713 
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You are right, I do not, and could not mean cross multiply.

I just mean add.

like how do you do

 

1/2  +  1/3   ?

You have to get a common denominator.

Melody  Jul 29, 2020
edited by Melody  Jul 29, 2020

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