tylkirby tylkirby
  • 21-01-2018
  • Mathematics
contestada

3x - 4y = -15 ; 4x +3y =5

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gustanika
gustanika gustanika
  • 21-01-2018
Using elimination method to find y
3x - 4y = -15  (multiply 4)
4x + 3y = 5    (multiply 3)
------------------------------------
12x - 16y = -60
12x + 9y  = 15
--------------------- - (substract)
         -25y = -75
               y = 3

Using subtitution method to find x
3x - 4y = -15
3x - 4(3) = -15
3x - 12 = -15
3x = -3
x = -1

The solution (-1,3)
Answer Link

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