SOLUTION: solve the linear system by using elimination 3x - 4y = -16 x - 4y = -40

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Question 840300: solve the linear system by using elimination
3x - 4y = -16
x - 4y = -40
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi

solve the linear system by using elimination 

 3x - 4y = -16 

 x - 4y = -40



 3x - 4y = -16 

 -x + 4y = 40    |multiplying 2nd EQ by -1 and adding to 1st EQ

   2x = 24

    x = 12  and y = 13     |x-4y=+-40, 12+40 = 4y, y = 52/4

CHECKING our answer***

using:  3x - 4y = -16 

 36 - 52= -16

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