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  • 14-12-2016
  • Mathematics
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Solve the following system of equations. -3x-2y=1. -4x+9y=-22

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Apocrophon
Apocrophon Apocrophon
  • 14-12-2016
-3x-2y=1
-4x+9y=-22

-3x-2y=1
-3x=2y+1
x=(2y+1)
      -3

-4x+9y=-22
-4(2y+1)+9y=-22
     (-3)
(-8y+1) +9y=-22
    -3

(-8y+1) + (-27y) = +66
-35y+1 = 66
-35y = 65

y= -13/7 or -1.85714

-3x-2y=1
-3x-2(-13)=1
           7
-3x+(26)=1
         7
-3x=1-(26)
            7
-21x= 7-26
-21x=19
x = -19   or 0.90476
       21

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