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algebra

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Solve the following system using the substitution method:
6x - 2y = -4
y = 3x + 2

  • algebra - ,

    sub the 2nd into the 1st:

    6x - 2(3x+2) = -4
    6x - 6x - 4 = -4
    -4 = -4

    infinite number of solutions, just use the 2nd, pick any x you feel like, and get the y
    e.g.
    x = 2
    y = 3(2)+2 = 8
    etc

    What you really have is the same equation twice.
    (multiply the 2nd by 2 and you will get the 1st)

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