Question 454258
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solve using substitution method

  x - 5y = 17
-5x - 6y =  8

This is a real LAUGH! Why on earth would someone choose to SOLVE for a variable that'll create FRACTIONS - which most people hate,
and which we normally GET RID OF when solving an equation - when a perfectly-stated equation, in eq (i), already has a variable
with a coefficient of 1? This ABSOLUTELY makes NO SENSE, at all!!! 

I know another person on this site, who has done the EXACT thing in some, maybe ALL, of her responses!! I wonder who taught them
these RIDICULOUS and NONSENSICAL solving techniques.

This may be one of the reasons why some people FEAR mathematics! I would, if I ever asked for help, and received this response!!

x - 5y = 17_____x = 17 + 5y ----- eq (i)
Isn't this what's needed to now substitute in eq (ii), so that the value of y can be determined, and then x, subsequently?</pre>