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March 27, 2015

March 27, 2015

Posted by **johnny** on Sunday, April 3, 2011 at 6:59pm.

- math -
**Jeannine**, Sunday, April 3, 2011 at 8:56pmx+Y=-4 EQ1

x-y=12 EQ2

x=y+12 EQ3

put in the first equation

x+y=-4

substitute equation 3 for x

y+ (y+12)=-4

2y+12=-4

2y= -4-12

2y =-16

y= -16/2

y= -8

Put the new value of y in EQ3

x= y+12

x= -8+12

x= 4

so two numbers are 4 and -8

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