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Posted by on Thursday, November 26, 2009 at 1:54pm.

On the problem 9x+7y=4
x=23-4y
solve by substitution

Do you mean to put 9 in the place of x=23-4y (9x=23-4y)

  • algebra - , Thursday, November 26, 2009 at 11:53pm

    It would look like this...9(23-4y)+7y=4
    Then you simplify
    9*23=207
    9*-4y=-36y
    so you now have
    207-36y+4y
    Combine like terms
    -36y+4y=-32
    -32y=4
    Finally you divide
    the end reslut is y=-8

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