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How to find the 4 value unknown in a matrix?

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  • How to find the 4 value unknown in a matrix?


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Answer #1 | 20/12 2013 00:58
|a b| |2| = |3| |c d| |1| = |4| Multiply the 2x2 matrix times the 2x1 matrix to get the two equations. (a)(2) + (b)(1) = (3) (c)(2) + (d)(1) = (4) 2a + b = 3 2c + d = 4 as you now have two equations in 4 unknowns, and the two unknowns in one equation do not appear in the other equation, all you can do is solve each equation independently for its two unknowns. 2a + b = 3 b = (-2a) + 3 a = -(1/2)*(b) + (3/2) 2c + d = 4 d = (-2c) + 4 c = -(1/2) + 2 This problem is just busy work.
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