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Dido525
 one year ago
Best ResponseYou've already chosen the best response.0Anyone want to help me get started? I am pretty sure I can do the rest on my own.

Cecily
 one year ago
Best ResponseYou've already chosen the best response.0Represent the system in matrix form

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0Yep, that's what I did.

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0How do I go on from there?

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1take the determinant of the coefficient matrix, and set it equal to zero.

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0Woah woah!!! We haven't learned what a determinant is yet. :P .

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1okay. how about gaussjordan reduction?

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0Yeah. We learned that.

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1i got something easier than gaussjordan. multiply equation 2 by (1), and equation 3 by 2, then add the two equations.

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1use that equation with equation 1 to eliminate both y and z.

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0THat dosen't eliminate it. It makes it bigger.

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1bx + 3y + 3z = a 3y + 3z = 2  a subtract.

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0I used substitution instead. Should till be valid right?

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1or if you wish to substitute...

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1bx + (2a) =a bx = 2a  2

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1you're not to eliminate a, but y and z.

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0Lets us elimination then lol.

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0Now would I solve for a and substitute this into equation 2?

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1now if you put b = 1, and a any real number other than 1, say 3, 0x = 4 0 = 4 which is clearly false.

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0Ohh never mind. I see why.

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0For infinitely many solutions I would make 0=0 right?

Dido525
 one year ago
Best ResponseYou've already chosen the best response.0Okay what about a unique solution? @sirm3d

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1unique solution when b is not equal to zero.

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.1any value of a for as long as b not zero will yield a unique solution
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