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I am having a hard time - please guide me to solve by the substitution method.
5m + n = 36
m -7n = 36

A big ty:)

  • algebra -

    Since m = 7n + 36,
    substitute 7n + 36 for m in the first equation.

    That should lead to
    35n + 180 + n = 36
    which is the same as
    36n = -144
    n = -4
    Now solve for m with either of your first two equations.

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