SOLUTION: I have no idea how to do this. Could someone work this out for me. 2x-3y+4z=10 5y-2z=-16 3z=9

Algebra ->  Linear-equations -> SOLUTION: I have no idea how to do this. Could someone work this out for me. 2x-3y+4z=10 5y-2z=-16 3z=9      Log On


   

Question 235540: I have no idea how to do this. Could someone work this out for me.
2x-3y+4z=10
5y-2z=-16
3z=9
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
2x-3y+4z=10
5y-2z=-16
3z=9
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Since the last eqn makes it easy, use substition
2z = 9
z = 3
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2x -5y-2z = -16
5y-6 = -16
5y = -10
y = -2
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2x-3y+4z = 10
2x + 6 + 12 = 10
2x = -8
x = -4
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Most systems of 3 are more tedious.