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-3x+7y=-16 -9x+5y=16

 Jun 3, 2015

Best Answer 

 #1
avatar+1191 
+10

Let's solve this one with elimination:

-3x+7y=-16

-9x+5y=16

 

Multiply the top equation by 3 so we can isolate the y's.

 

-9x+21y=-48.

-9x+5y=16.

 

Subtract: 16y=-64, y=-4.

Plug the y value into any of the original equations you like.

-3x-28=-16.

-3x=12.

x=-4.

The lines intersect at the point (-4,-4)

 Jun 3, 2015
 #1
avatar+1191 
+10
Best Answer

Let's solve this one with elimination:

-3x+7y=-16

-9x+5y=16

 

Multiply the top equation by 3 so we can isolate the y's.

 

-9x+21y=-48.

-9x+5y=16.

 

Subtract: 16y=-64, y=-4.

Plug the y value into any of the original equations you like.

-3x-28=-16.

-3x=12.

x=-4.

The lines intersect at the point (-4,-4)

DarkBlaze347 Jun 3, 2015
 #2
avatar+99356 
0

Great explanation DarkBlaze347  

 Jun 4, 2015

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