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Solve the system using row reduction on a calculator.

2x+3y+6z=-2
x-2y+4z=16
3x-5y=8
A. (-4,4,3)
B. (-4,-4,3)
C. (4,4,-3)
D. (4,-4,-3)

1 Answer

4 votes

Final answer:

To solve the system using row reduction on a calculator, represent the system as an augmented matrix and perform row reduction operations. The solution is (-4, -4, 3)

Step-by-step explanation:

To solve the system using row reduction on a calculator, we need to represent the given system of equations as an augmented matrix. The augmented matrix for the system is:

[[2, 3, 6, -2], [1, -2, 4, 16], [3, -5, 0, 8]]

Next, we need to perform row reduction operations on the matrix to obtain its row echelon form or reduced row echelon form. After performing the row reduction operations, we get:

[[1, 0, 2, -4], [0, 1, -2, 4], [0, 0, 0, 0]]

The row echelon form of the augmented matrix corresponds to the system of equations:

x + 2z = -4

y - 2z = 4

0 = 0

From the last row, we can see that there is a free variable, z. We can express the solutions in terms of z as follows:

x = -4 - 2z

y = 4 + 2z

So, the solution to the system is given by (-4 - 2z, 4 + 2z, z), where z can take any value. Therefore, the correct answer is option B. (-4, -4, 3).

User JFPicard
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