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HELP PLZ! Algebra 10 points?!?

+2 votes
|10 3 -4|
|0 1 -2 | = 12
|X 6 1/5|

this is supposed to be a matrix. can anyone help me find what X would equal? 10 points to the best answer
asked Feb 15, 2013 in ALGEBRA 2 by andrew Scholar

1 Answer

+2 votes

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Determinate of a 3×3 matrix.

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Here: a=10, b=3, c=-4, d=0, e=1, f=-2, g=x, h=6 and i=1/5

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Add 2x to each side.

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2x = 110

Divide each side by 2.

x = 55.

answered Feb 15, 2013 by richardson Scholar

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