SOLUTION: Suppose that you take care of pets for vacationing neighbors each summer. You charge $15 per day to feed and walk a dog and $5 per day to feed other pets. You know that you can c

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x dogs and y pets other than dogs



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The solutions are between the two lines, including
the lines also, but only in the positive x and y regions
(one cannot care for negative number of pets)
As a check, I can test some points that are in the
solution zone and one outside
Inside: (8,1), (1,7)
Outside: (1,2)
(8,1)


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Ok
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(1,7)


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OK
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(1,2) should not work

NOT OK
So, this is outside and fails as it should