SOLUTION: Consider the system of equations: x + y + z = 210; x + z = 230; x + y = 120 What is the value of x?

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Question 620121: Consider the system of equations: x + y + z = 210; x + z = 230; x + y = 120 What is the value of x?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

system of equations: 

x + y + z = 210

x + z = 230 

  y + 230 = 210 , y = -20



x + y = 120 

x +(-20) = 120

     x = 140



CHECKING our Answer*** Note: z = 90

 140 -20 + 90 = 210