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 #1
avatar+130511 
+5

So we have this

16 ≥ x^2 + y^2 ≤ 25

Taking this in pieces, we have

x^2 + y^2 ≤ 16   and   x^2 + y^2 ≤ 25

Here's the graph of both........https://www.desmos.com/calculator/svaaytcslp

Note that the "solution" is the "blue area" inside  the "red area".....and this is just the graph of x^2 + y^2 ≤ 16.....!!!!

 

Dec 9, 2014

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