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14 November, 19:10

3x - y = 6 and y = x - 4, use addition to solve the linear system of equations.

Alright, so I'm trying to figure this out, at first I made y = x - 4 into x - y = 4, then thought I could've gotten it wrong and made it into - x + y = 4. In that one, trying to add the two equations together got me - 4x = 2, 2/4 = 0.5 and I already know x = 1 and y = - 3, but I just don't understand how to get there?

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  1. 14 November, 22:17
    0
    3x-y=6

    y=x-4

    solve by substitution

    3x-x+4=6

    2x=2

    x=1

    Now that you know x, but in in the equation to find y (either equation will work)

    y = 1-4

    y = - 3

    now that you have both answers, let's check them.

    3 (-1) - (-3) = 6

    yes, it works ...

    Hopefully this makes sense!
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