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Solve this system using the elimination method:
2x+9y= -15 ***
5x+9y= -24   |Subtracting 2nd from 1st EQ to eliminate y
 -3x = 9
   x = -3  and y = -9/9 = -1   
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P(-3,-1) solution to system of Equations
 CHECKING our answer***
Using 5x + 9y = -24
      -15 - 9 = -24