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6 October, 03:41

Equation; what is x+y=3 x-2y=0?

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  1. 6 October, 04:05
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    x = 3 and y = 1

    Step-by-step explanation:

    Lets name the first equation as equation 1.

    [Equation 1] x + y = 3

    Then name the second equation as equation 2.

    [Equation 2] x - 2y = 0

    The first purpose is to eliminate one of the variable. In this case, it looks like it is easier to eliminate x since both equations have single x.

    We will use [Equation 1] - [Equation 2] to eliminate x and find the value of y.

    (x + y) - (x - 2y) = 3 - 0

    x + y - x + 2y = 3

    3y = 3

    y = 1

    Now that we know y = 1, we will substitute this value into any of the two equations to find the value of x. Here, I choose to substitute into [equation 1].

    x + y = 3

    x + 1 = 3

    x = 2

    So now we found out that x = 2 and y = 1.
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