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MeganDarling

Pleasee help x.x 1. Solve the system by elimination- -2x+2y+3z=0 -2x-y+z=-3 2x+3y+3z=5 2.Solve using substitution- x-y-z=-8 -4x+4y+5z=7 2x+2z=4 Thanks for any help :o

  • one year ago
  • one year ago

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  1. MeganDarling
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    Heya lol.. So any help?

    • one year ago
  2. MeganDarling
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    Agh that doesn't help me at all x.x

    • one year ago
  3. MeganDarling
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    I see that :o

    • one year ago
  4. MeganDarling
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    O.o I most certainly cannot x.x

    • one year ago
  5. MeganDarling
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    I'm dumb D:

    • one year ago
  6. Hero
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    Megan, your homework makes me sleepy

    • one year ago
  7. MeganDarling
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    haha oh Hi hero x.x

    • one year ago
  8. MeganDarling
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    I just need to be able to show all the correct steps with these 2 x.x they are worth a lot of points Dx

    • one year ago
  9. Hero
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    I'm willing to help you with the constraint and profit problems, but for the system of three equations, I'd rather use matrices.

    • one year ago
  10. MeganDarling
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    I'm supposed to be learning how to do that too x.x

    • one year ago
  11. Hero
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    I'm not a teacher. I will post the full solutions to the problems, which will explain the steps that way. However, if you have any questions about anything, I can try to answer. What I refuse to do is "guide" student to an answer since, in a way, it wastes time.

    • one year ago
  12. MeganDarling
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    -8x-8y=16 6x-9y=-108 With this problem I'm supposed to solve using matrices :P

    • one year ago
  13. MeganDarling
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    haha I guess so

    • one year ago
  14. Hero
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    Well, before you do anything, reduce both first.

    • one year ago
  15. Hero
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    Divide the first equation by 8 and the second by 3

    • one year ago
  16. MeganDarling
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    oh oops the first one =-16 my bad there.

    • one year ago
  17. Hero
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    I'm just going to to respond to one of the previous questions you posted.

    • one year ago
  18. MeganDarling
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    er okay :o

    • one year ago
  19. Henry.Lister
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    With Question 1. A system of elimination requires to to add or subtract two equations together to eliminate a variable. Since you have three equations, you will want to bring that down to two equations with two variables. If you minus the second equation from the first equation: -2x+2y+3z=0 (-) -2x-y+z=-3 (=) 3y+2z=3 Now we want to create a second equation that only has the two variables y and z. We also want to create a second equation that is different from the first one. To do this we need to involve the 3rd equation. In this case we will add the first and the last equations together. -2x+2y+3z=0 (+) 2x+3y+3z=5 (=) 5y+6z=5 Now we have two equations to solve together by adding or subtracting. But in this case we will have to alter equation 2 (multiply all of it by 3) so that we can subtract one from 2. 3y+2z=3 (x3) 9y+6z=9 Now we can subtract. 5y+6z=5 (-) 9y+6z=9 (=) -4y=-4 y=1 Now that we have a value of y we can substitute that back into our equations to get other values. 3(1)+2z=3 3+2z=3 z=0 Now sub z=0 and y=1 back into equation 1. -2x+2(1)+3(0)=0 -2x+2=0 x=1

    • one year ago
  20. MeganDarling
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    Thank you so much Henry (: Your awesome

    • one year ago
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