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March 28, 2017

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Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this.
3x – 15y = -12
3x + 24y = -12

  • algebra - ,

    Rather than substitution, why don't we just subtract them as they stand.
    -29y = 0
    y = 0
    then 3x = -12
    x = -4

    If you really have to use substitution,
    form the first , 3x = 15y - 12
    into the 2nd
    15y - 12 + 24y = -12
    29y = 0
    then 3x = 15(0) - 12
    3x = -12
    x = -4

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