algebra

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the spreadsheet shows the monthly revenue and expenses for a new business.use the models to predictt the month in which revenue will equal expense.
month revenue expenses
jan 4000 22,000
feb 9000 24,000
mar 13,000 25,000
apr 16,000 27,000
may 21,000 30,000
Would someone please help and explain how to figure this out.

This is all I'v come up with and am not sure which one is the right answer or how you get to this point.

r=4100x-300
e=1900x-19900
oct.

4100x=300
1900X+19900
sept.

r=4100x+300
e=1900x+19900
aug.

r=4100x-300
e=1900+19900
sept.
If only someone could explain

  • algebra -

    do a least-squares fit to find the best lines for r and x:

    r(m) = 4100m + 300
    x(m) = 1900m + 19900
    for month #m.

    So, r=x when

    4100m+300=1900m+19900
    m = 98/11, or 9: September

    r(9) = 37200
    x(9) = 37000

  • algebra -

    september

  • algebra -

    Again, the one person who is willing to put up the answers to help those who want to either check if they're correct and want to see what they did wrong or for those who dont want to try and are stupid.
    Solving Systems Using Tables and Graphs quiz
    1.D
    2.A (-4, -3)
    3.B September
    4.C -2x - y = 9 3x - 4y = -8 is (Independent)
    5.B 12x + 3y = 12 y = -4x +5 (Inconsistent)

    This is 100% correct, and I know there are a holes who like to put up the wrong answers for some sick twisted reason, I am not one.

  • algebra -

    Thank Me is 100% correct.
    Thanks

  • algebra -

    5/5 thanks! Thank Me

  • algebra -

    Thank Me is correct!!! Thanks a bunch, I was struggling with this

  • algebra -

    The answers for this, Solving Systems Using Tables and Graphs Unit 4 Lesson 1 for anyone who have 4 questions instead of 5 questions are

    1) D (3, 1) where one line goes through -2 on the Y-axis and 2 on the X-axis

    2) B (-3, 4) for solving system with table { -0.6x - 0.6y = -0.6} and { 0.5x - 0.3y = -2.7}

    3) September

    4)

  • algebra -

    4) B Inconsistent { 12x + 3y = 13} { y = -4x + 5}

    [[[Sorry, i had accidentally hit submit when trying to type out the 4th answer!]]]

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