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Math Help - Solve the system of equations below by graphing them with a pencil and paper.

  1. #1
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    Solve the system of equations below by graphing them with a pencil and paper. Choose the correct ordered pair (b, u).

    u = -b + 21
    u = -2b + 30
    Last edited by mr fantastic; May 6th 2010 at 05:03 PM. Reason: Re-titled, merged posts.
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  2. #2
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    Graph the two lines. The answer is the point where they intersect.

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  3. #3
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    i got it how about this 1 Solve the system of equations below by graphing them with a pencil and paper. Enter your answer as an ordered pair.

    y = -x + 2
    y = -2x + 6
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  4. #4
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    Exactly the same way you did the first one.

    Make sure you have a ruler, pencil, eraser and steady hands.
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  5. #5
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    wat do i graph
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  6. #6
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    Quote Originally Posted by daniel323 View Post
    wat do i graph
    Each of these

    y =-x+2
    y=-2x+6

    are straight lines, graph them both then following advice given in post #2.
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  7. #7
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    cant do it
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  8. #8
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    What have you tried?
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  9. #9
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    wat am i suppose to graph the 6 and 2 or the x
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  10. #10
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    Quote Originally Posted by daniel323 View Post
    wat am i suppose to graph the 6 and 2 or the x
    I showed you how to do this in a previous thread.

    I also showed you how to solve a system.

    Go try to figure out what is going on there, and come back with any serious questions.
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  11. #11
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    the other problem the numbers are the same so it diffrent
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  12. #12
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    Quote Originally Posted by daniel323 View Post
    the other problem the numbers are the same so it diffrent
    HINT: Multiply the first equation through by -2.
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  13. #13
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    so is the answer 1,3
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  14. #14
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    Quote Originally Posted by daniel323 View Post
    so is the answer 1,3
    How did you get that?

    y = -x + 2
    y = -2x + 6

    Following the hint we multiply the first equation through by -2 to get:

    -2y = 2x - 4
    y = -2x + 6

    Now what do you want to do?
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  15. #15
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    how did u get 4 in there
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