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anonymous

  • 5 years ago

3x-9y =81 2x-6y=-10 solve then classify the system

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  1. dumbcow
    • 5 years ago
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    did you try elimination method or addition method

  2. anonymous
    • 5 years ago
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    ive been working with the elimination method i wonder if the substitution method might work too but i havent gotten the right answer either way

  3. dumbcow
    • 5 years ago
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    either way will work for this problem i think elimination is easier lets cancel out the x's LCM of 2 and 3 is 6 multiply 1st row by -2 multiply 2nd row by 3 -6x +18y = -162 6x -18y = -30 ______________________ 0 + 0 = -192 0 = -192 this is False No solution

  4. dumbcow
    • 5 years ago
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    system is inconsistent

  5. anonymous
    • 5 years ago
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    if this occurs, then it's Undefined...

  6. anonymous
    • 5 years ago
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    that means it would be dependent as well right?

  7. anonymous
    • 5 years ago
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    x=dependent y=independent and since u don't know either one. "Undefined" then it can't be dependent or independent. unless i'm not seeing something here.

  8. dumbcow
    • 5 years ago
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    what do you mean undefined?? no not dependent, thats only if there are infinite solutions no solution means these 2 lines are parallel, same slope

  9. anonymous
    • 5 years ago
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    Oh. True sorry i wasn't looking at it like this. Just haven't done this for a long time...

  10. anonymous
    • 5 years ago
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    ok so it would be independent and inconsistent since both are parallel

  11. dumbcow
    • 5 years ago
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    correct

  12. anonymous
    • 5 years ago
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    ok now the last part of the question to this one is to show it in graph form what would this problem look like graphed

  13. dumbcow
    • 5 years ago
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    where do you think you were messing up?

  14. dumbcow
    • 5 years ago
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    graph both lines either by putting them in y=mx+b form or make a table of x,y values and connect the points

  15. anonymous
    • 5 years ago
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    whats bad is im trying to learn algebra in a 9 week period and ive never done it in my life back in high school we had the whole yr to learn this

  16. dumbcow
    • 5 years ago
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    oh online class ? yeah that can be hard

  17. anonymous
    • 5 years ago
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    it is very frustrating

  18. anonymous
    • 5 years ago
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    so y=(81-3x)/-9 and y=(-10-2x)/-6

  19. anonymous
    • 5 years ago
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    I've taken online math before. But it's always gave me an option to view and example of the problem how to solve. It's harder for u...

  20. anonymous
    • 5 years ago
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    im posting problems i have trouble with and am hoping to see them worked out with the answer so i can see how they are done but many just give me the answer which is not helping

  21. anonymous
    • 5 years ago
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    the graphing problems are hardest becaise noone really can show me what they look like

  22. anonymous
    • 5 years ago
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    have you herd of Graphing Calculators? Texas Instruments...

  23. dumbcow
    • 5 years ago
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    @beehive yeah those examples can be really helpful but they dont answer everyones questions and you dont know why you do the steps it shows you to do

  24. dumbcow
    • 5 years ago
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    graphcalc.com free graphing software

  25. anonymous
    • 5 years ago
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    ill chk it out im gonna post a few more and head to bed my head istarting to hurt lol

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