Posted by **eric** on Thursday, July 7, 2011 at 9:20am.

10x-5y=20

7x-5y=-26

- algebra system of equation -
**Henry**, Friday, July 8, 2011 at 5:00pm
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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