1) Solve simultaneously:

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- February 11th 2008, 12:13 PMacevipaSimultaneous Equation
1) Solve simultaneously:

- February 11th 2008, 12:45 PMangel.white
Initial matrix

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Subtract 3 line twos from line 1

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Subtract 4 line twos from line 3

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Subtract 11/7 line ones from line 3

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Multiply line 3 by 7/72

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Substitute the value of w into lines 1 and 2

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Add 25 to line1 and subtract 7 from line2

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Multiply line one by 1/7

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Substitute the value of v into line 2

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Add 12 to line2

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Switch lines 1 and 2

- February 12th 2008, 01:38 AMmr fantastic
Beautiful latex, angel.white (Clapping)

An alternative approach that avoids*explicitly*using matrices:

(1) - 3 x (2): 7v - 25w = 17 .... (A)

(3) - 4 x (2): 11v - 29w = 37 .... (B)

Now solve (A) and (B) in the usual way (I'd suggest elimination method): v = 6, w = 1.

Now sub v = 6 and w = 1 into either (1), (2) or (3). - February 12th 2008, 01:56 AMangel.white