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Math Help - Simultaneous Equation help.

  1. #1
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    Simultaneous Equation help.

    Hi guys, hoping this is the right forum.

    I've got a Maths assignment I'm working on and I've completed the whole paper save one question. I'm really not sure how to go about doing this - here's the question:

    5 = 0.4i1 + 1.8(i1-i2)
    12 = 2.4i2 - 1.4(i1-i2)

    Hope that's readable. I've tried substituting, but that (i1-i2) really throws me off. Anybody able to help?

    Thanks in advance.
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  2. #2
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by sebhaque View Post
    Hi guys, hoping this is the right forum.

    I've got a Maths assignment I'm working on and I've completed the whole paper save one question. I'm really not sure how to go about doing this - here's the question:

    5 = 0.4i1 + 1.8(i1-i2)
    12 = 2.4i2 - 1.4(i1-i2)

    Hope that's readable. I've tried substituting, but that (i1-i2) really throws me off. Anybody able to help?

    Thanks in advance.
    <br />
0.4i_1 + 1.8(i_1 - i_2) = 0.4i_1 + 1.8i_1 - 1.8i_2 = 2.2i_1 - 1.8i_2 = 5

    <br />
2.4i_2 - 1.4(i_1 - i_2) = 2.4i_2 - 1.4i_1+1.4i_2 = 3.8i_2 - 1.4i_1= 12<br />

    2.2i_1 - 1.8i_2 = 5 (1)

    3.8i_2 - 1.4i_1= 12 (2)

    Solve in the standard way
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  3. #3
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    Oh dear, I must have done far too much Maths today to have missed that!

    Thanks very much for the quick response.
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