Question

please help me solve all real values of x only in this system...

3x + 9y + 6z = 3
2x + y - z = 2
x + y + z = 2

Answer 1

row reduce the matrix

|3 9 6 3|
|2 1 -1 2|
|1 1 1 2|

Answer 2

or, determine the line of the intersection of 2 of the planes to determine where that line intersects the remaing plane at

Answer 3

or, use substitution methods or elimination methods ....

Answer 4

thanks! :)

Answer 5

yep

Answer 6

id prolly do the row reduce since a computer does all the thinking for you :)

Answer 7

http://www.wolframalpha.com/input/?i=rref%7B3%2C+9%2C++6%2C+++3%7D%2C%7B2%2C+1%2C+-1%2C++2%7D%2C%7B1%2C+1%2C++1%2C+++2%7D%7D

the point is read as: (x,y,z) from the right most column of the rref

Answer 8

thanks! :)

Answer 9

yw