Asked by HELP PLS
Solve the system of equations using a matrix.
{ x + 7y = 12
{ 2x - y = 9
{ x + 7y = 12
{ 2x - y = 9
Answers
Answered by
oobleck
you have AX = B
where
A =
(1 7)
(2 -1)
X =
(x)
(y)
and B =
(12)
(9)
Since AX = B, X = A<sup><sup>-1</sup></sup>B
A<sup><sup>-1</sup></sup> = 1/15 * A
and so
(x y) = (5 1)
where
A =
(1 7)
(2 -1)
X =
(x)
(y)
and B =
(12)
(9)
Since AX = B, X = A<sup><sup>-1</sup></sup>B
A<sup><sup>-1</sup></sup> = 1/15 * A
and so
(x y) = (5 1)
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