Solve the system of equation by elimination. 2x+9y=272x+9y=27 3x-9y=-723x−9y=−72

1 thought on “Solve the system of equation by elimination. 2x+9y=272x+9y=27 3x-9y=-723x−9y=−72”

1. Answer:

   [1]XXXX9x−9y=27

   [2]XXXX7y−3x=−11

   Resequence the terms of [2] so the variables occur in the same order as in [1]

   [3]XXXX−3x+7y=−11

   Multiply [3] by 3

   [4]XXXX−9x+21y=−33

   Add [1] and [4]

   [5]XXXX12y=−6

   Divide [5] by12

   [6]XXXXy=−12

   Substitute y=−12 into [1]

   [7]XXXX9x−9(−12)=27

   Simplifying

   [8]XXXX9x=452

   [9]XXXXx=52

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