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system of linear equations help!!

40-77
0-4-76
00-13/20
0000

-8
8
0
0



how do i find the leading variables and number of parameters?
can someone please teach me how do i get the solution for this question? thanks :smile:
Original post by chungyee994

how do i find the leading variables and number of parameters?
can someone please teach me how do i get the solution for this question? thanks :smile:


[40−77−80−4−76800−13/20000000]\left[\begin{array}{cccc|c} 4 & 0 & -7 & 7 & -8 \\0&-4&-7&6&8\\0&0&-13/2&0&0\\0&0&0&0&0\end{array} \right]

Is this the same as the augmented matrix above?

If we call the variables, v,w,x,y in order.

Then start at the bottom and work up.

0y=0, so y could be anything.

Etc.

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