Question 790724
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Multiply the first equation by -60:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ -60f\ -\ 60s\ =\ -105]


Add this new, equivalent equation to your second equation:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ -60f\ +\ 80f\ -\ 60s\ +\ 60s\ =\ -105\ +\ 110]


Collect like terms:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 20f\ =\ 5]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ f\ =\ \frac{1}{4}]


So 


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ s\ =\ \frac{3}{2}]


Why did I choose -60 as a multiplier for the first step?  Is there a different multiplier that would have solved the problem just as effectively?


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
<font face="Math1" size="+2">Egw to Beta kai to Sigma</font>
My calculator said it, I believe it, that settles it
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