# Repeat Exercise 5 using C1 = D1/2. In Exercise 5 a. 3x1 x2 + x3 = 1, x1 +

## Question:

In Exercise 5

a. 3x1 − x2 + x3 = 1,

−x1 + 6x2 + 2x3 = 0,

x1 + 2x2 + 7x3 = 4.

b. 10x1 − x2 = 9,

−x1 + 10x2 − 2x3 = 7,

− 2x2 + 10x3 = 6.

c. 10x1 + 5x2 = 6,

5x1 + 10x2 − 4x3 = 25,

− 4x2 + 8x3 − x4 = −11,

− x3 + 5x4 = −11.

d. 4x1 + x2 − x3 + x4 = −2,

x1 + 4x2 − x3 − x4 = −1,

−x1 − x2 + 5x3 + x4 = 0,

x1 − x2 + x3 + 3x4 = 1.

e. 4x1 + x2 + x3 + x5 = 6,

x1 + 3x2 + x3 + x4 = 6,

x1 + x2 + 5x3 − x4 − x5 = 6,

x2 − x3 + 4x4 = 6,

x1 − x3+ +4x5 = 6.

f. 4x1 − x2 − x4 = 0,

−x1 + 4x2 − x3 − x5 = 5,

− x2 + 4x3 − x6 = 0,

−x1 + 4x4 − x5 = 6,

− x2 − x4 + 4x5 − x6 = −2,

− x3 − x5 + 4x6 = 6.

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