Posted by eric on Thursday, July 7, 2011 at 9:20am.
Eq1: 10x-5y = 20.
Eq2: 7x-5y = -26.
Multiply Eq1 by -1:
-10x+5y = -20,
+7x-5y = -26.
Sum:x = -3x+0 = -46,
x = -46/-3 = 15 1/3.
In Eq2, substitute 46/3 for x:
7(46/3) - 5y = -26,
Solve for y and get:
26 2/3 = 80/3.
Solution Set = (x,y) = (15 1/3,26 2/3).
Check the given Eqs and make sure the signs are correct.
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