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December 21, 2014

December 21, 2014

Posted by **sandra** on Saturday, April 7, 2012 at 9:02pm.

2x+2y=1

3x-y=6

thanks

- math -
**Joe**, Saturday, April 7, 2012 at 9:06pm2x+2y=1

This one is obvious. Just divide the coefficients by each other, and take any inequalities and subtract them by themselves.

3x-y=6

This one is a bit tougher. First, you need to square everything. Then add 4, subtract 7, and take the square root of it all. It may not seem right, but it IS fairly complex.

- math -
**Anonymous**, Saturday, April 7, 2012 at 9:09pm2x+2y=1

6x-2y=12

-4x=-11

x= 11/4

2(11/4)+2y=1

1-22/4=2y

-18/4=2y

-18/8=y

- math -
**Reiny**, Saturday, April 7, 2012 at 10:36pm1st equation ---> 2x + 2y = 1

2nd equation times 2 ---> 6x - 2y = 12

add them

8x = 13

x = 13/8

sub into 1st:

2(13/8+ 2y = 1

2y = 1 - 13/4

2y = -9/4

y = -9/8

x = 13/8 , y = -9/8

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