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August 30, 2015

Homework Help: math-matrix equations

Posted by Jennifer on Friday, May 2, 2008 at 3:36pm.

I have a problem with the following homework question:
Which product represents the solution to the system: -y + 7x=14
-x + 4y=1

a. | (1/27) (4/27)|
| (7/27) (1/27)|

b. | (-7/3) (4/3) |
| (-1/3) (1/3) |

c. | (7/3) (-4/3) |
| (1/3) (-1/3) |

d. | (-1/27) (-4/27) |
| (-4/27) (-1/27) |

in every answer above, the matrices are multiplied by
|1 |
|14|

I'm totally confused about how they got those answers...I came up with this as a solution: 1/27 mult. by
|4 1 |
|1 7 | mult. by
|14 |
|1 |
i'm not sure what i'm doing wrong...
i really need help with this question. thanks in advance!

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