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1 October, 07:54

Solve the system using the method of your choice: y = 2x - 2

x + 3y = 15

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  1. 1 October, 10:31
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    Y = 2x - 2

    x + 3y = 15

    I'll do substitution by solving for y:

    y = 2x - 2

    Solve for y for the second equation:

    y = 5 - x/3

    Substitute:

    2x - 2 = 5 - x/3

    Add x/3 to both sides:

    7x/3 - 2 = 5

    Add 2:

    7x/3 = 7

    Multiply by 3:

    7x = 21

    Divide by 7:

    x = 3

    Substitute x in for one of the original equations:

    y = 2 (3) - 2

    y = 6 - 2

    y = 4

    The solution set is (3, 4).
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