Elementary Algebra Question

label Algebra
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Can I get some help in the 3rd question in this link below?

https://docs.google.com/file/d/0ByXp6Ibu-fCyOTBhMmE5MjgtN2U2Yy00YWI1LThmNDQtZjAzOWVmMTdmNjc1/edit?pli=1

May 16th, 2015

YES (2,-1) IS A SOLUTION SET TO 3x-y=7 

As if we put the values we will get 3*2 - (-1) = 7 

                                                   = 6 +1 = 7

                                                   =    7   = 7 (hence it is true )

May 16th, 2015

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May 16th, 2015
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May 16th, 2015
Sep 26th, 2017
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