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Jibreel H
Jibreel H asked in Science & MathematicsMathematics · 7 years ago

How do I solve this practice math problem?

Use matrices to find the system of equations (if possible). Use Gaussian elimination with

back-substitution or Gauss-Jordan elimination.

{x+2y=12}

{2x+y=15}

a.(6,3)

b.(18,6)

c. (3,18)

d.(5,6)

e.(3,6)

1 Answer

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  • ?
    Lv 7
    7 years ago
    Favorite Answer

    [1   2  12]

    [2   1  15]

    [1   2  12]

    [0  -3   -9] ← r2-2r1

    [1   2  12]

    [0   1    3] ← r2×-1/3

    [1   0   6] ← r1-2r2

    [0   1   3]

    (x, y) = (6, 3)

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