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Hi. So i am confused on this method invented that i have to solve systems of equations with some cross out method that makes 0 sense.

 

Here is the problem

 

-4x-2y=-12 (BUT)

4x+8y=-24.

Can someone please help?

 Mar 6, 2015

Best Answer 

 #4
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+5

oh my bad sorry I am used to all of the answers on the bottom Lol.

 Mar 6, 2015
 #1
avatar+23254 
+5

-4x -  2y  =  -12

 4x + 8y  =  -24

If you add down the individual columns, all the x-terms will disappear:

         6y  =  -36

Now, divide by 6 --->   y  =  -6

Replace this back into either of the two original equations; if you use the second equation:

  4x + 8y  =  -24   --->   4x + 8(-6)  =  -24   --->   4x - 48  =  -24

                              add 48 to both sides:                    4x  =  24

                              divide by 4:                                   x  =  6

 Mar 6, 2015
 #2
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geno ty for the answer, but i need one for the Y as well. not just x.

 Mar 6, 2015
 #3
avatar+23254 
+5

Check the 5th line from the top ...

 Mar 6, 2015
 #4
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+5
Best Answer

oh my bad sorry I am used to all of the answers on the bottom Lol.

Guest Mar 6, 2015

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