Can I get help for the 14th question from this link?

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

14. x - 3y = -10

so, x = 3y - 10

Now we substitute that into the second equation

2(3y - 10) + 5y = 2

6y - 20 + 5y = 2

11y = 22

y = 2

x = 3(2) - 10

x = - 4

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