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How do I solve this step by step

 

using linear  combination method 

 

2x-3y=13

 x+2y=-4

 Jan 28, 2020
 #1
avatar+21773 
+2

 

2x-3y=13

 x+2y=-4       Multiply THIS equation by -2

-2x-4y=8      add this to TOP equation

-7y = 21

   y = -3      now substitue this 'y' value back into one of the equations to find the 'x' value of the coordinate

 Jan 28, 2020
 #2
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So rather than putting 

 x+2y=-4

I put 

 x+-3y=-4

 Jan 28, 2020
 #3
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Or do i put -3 in the x

 Jan 28, 2020
 #4
avatar+21773 
+2

You can pick either of the equations....just put in  -3   where 'y' is to find x

 

x + 2(-3) = -4

ElectricPavlov  Jan 28, 2020

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