# Thread: Non square system, system with fewer equations than variations

1. ## Non square system, system with fewer equations than variations

-45x+18y+ 21z= -12
9x+9y+7z=6

all I have gotten so far is
-45x+18y+21z= -12
63y+56z= 18

i know youre supposed to make z=a but I don't know where to go from here. Please help me out and I need the answers ASAP!

2. ## Re: Non square system, system with fewer equations than variations

Originally Posted by Mc3
-45x+18y+ 21z= -12
9x+9y+7z=6

all I have gotten so far is
-45x+18y+21z= -12
63y+56z= 18

i know youre supposed to make z=a but I don't know where to go from here. Please help me out and I need the answers ASAP!
You will end up with equations for x, y, and z in terms of one unknown. (You don't have enough equations to get this to single values of x, y, z.) So simply put z = a. Then you have two equations for x and y. Solve them for x and y in terms of a.

And hey, we get the answers done when someone looks at them, not before. So whereas I know you're in a hurry you are simply going to have to be patient about it and not try to rush us. Please be more polite.

-Dan