How do you solve the system #x-2y+2z=-2, -x+4y-2z=3, 2x-4y+z=-7#?
1 Answer
Please see the explanation for steps leading to the solution:
Explanation:
Write the 3 equations as an augmented matrix:
Add row 1 to row 2:
Multiply row 1 by -2 and add to row 3:
Divide row 3 by -3:
Add row 2 to row 1:
Divide row 2 by 2:
Multiply row 3 by -2 and add to row 1:
The means that
check:
This checks