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solve each system of equations

A) 7x-5y+4z-9=0
   -x+3y+5z-2=0
   5x+y+14z-20=0
 
b) 7x-5y+4z-9=0
-5x+4y+z-3=0
x+2y-z+1=0
 
c) -3x+2y-z+10=0
6x-4y+2z-10=0
5x+7y+9z-14=0
 
d) 5x-9y+2z-3=0
4x+2y-3z+4=0
9x-7y-z+1=0

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Phillip R. | Top Notch Math and Science Tutoring from Brown Univ GradTop Notch Math and Science Tutoring from...
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do you want to use algebra (elimination) or matrices?

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