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Posted by on Tuesday, February 22, 2011 at 4:21pm.

-3x + 2y = 8
x + 4y = -4

use substitution method to solve the linear system.

  • Algebra - , Tuesday, February 22, 2011 at 5:47pm

    -3x + 2y = 8
    x + 4y = -4

    x + 4y = -4
    x = -4 - 4y

    Substitute, x = -4 - 4y in,
    -3x + 2y = 8

    -3(-4 - 4y) + 2y = 8
    12 + 12y + 2y = 8
    14y = -4
    y = -4/14
    y = -2/7

    Substitute, y = -2/7 in either equation to find x.

    Then check your solutions in the original equations.

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