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anonymous

  • 5 years ago

solve by substitution method 0.1x+0.9y=-4.1 0.6x-0.7y=5.9

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  1. anonymous
    • 5 years ago
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    this time is your turn. Try to find the answer by yourself. The first thing to to here is to convert 0.1, 0.9, 4.1, 0.6, 0.7 and 5.9 into a fraction. 0.1 = 1/10 0.9=9/10 4.1=41/10 0.6=6/10 0.7=7/10 5.9=59/10 You have to follow the procedure Mathmind gave you before. If you have any question, ask :)

  2. anonymous
    • 5 years ago
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    im stuck on this one with the decimals. I tried the formula but something is not adding up right.

  3. anonymous
    • 5 years ago
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    the equation after the conversion is: (1/10)x+(9/10)y=-41/10 -> equation1 (6/10)x-(7/10)y=59/10 -> equation2 now choose one equation (either 1 or 2) and isolate one variable (4 example x). Try to isolate x from equation 1

  4. anonymous
    • 5 years ago
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    1/10x+9/10y=41/10

  5. anonymous
    • 5 years ago
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    Because both equation 1 and 2 have the same denominator, you can simplify it. The equation system will look like this: x+9y=-41 -> equation1 6x-7y=59 -> equation2 Now isolating x from equation one, we get: x=-41-9y What is the next step to take?

  6. anonymous
    • 5 years ago
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    I need your feedback man :)

  7. anonymous
    • 5 years ago
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    thinking

  8. anonymous
    • 5 years ago
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    6(-41-9y)-7y=59

  9. anonymous
    • 5 years ago
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    Exactly! If we isolated x from equation 1, we have to replace this x (-41-9y) into equation 2. This is like a rule. For example, if you isolate x from equation 2, then you have to replace this x into equation 1. Now find the value for y

  10. anonymous
    • 5 years ago
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    -246-45y-7y=59 -246-52y=59 -52y=305

  11. anonymous
    • 5 years ago
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    oops math error i multiplied wrong

  12. anonymous
    • 5 years ago
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    ok redo it and show me the correct answer.

  13. anonymous
    • 5 years ago
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    y=5

  14. anonymous
    • 5 years ago
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    exactly you got it. Now you have to replace this value (y=5) into either eq1 or 2 and you will find the x value. That is all you have to do my friend. Well done :) Sorry for my English :( my native language is spanish

  15. anonymous
    • 5 years ago
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    im inserting the 5 for y but its not adding up right

  16. anonymous
    • 5 years ago
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    let me check it out

  17. anonymous
    • 5 years ago
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    y is not equal to 5, but -5

  18. anonymous
    • 5 years ago
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    try with this value for y

  19. anonymous
    • 5 years ago
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    Do you understand what substituting means?

  20. anonymous
    • 5 years ago
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    I think so

  21. anonymous
    • 5 years ago
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    I know you know but Im asking rich if he understands the concept of substituting.

  22. anonymous
    • 5 years ago
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    no but im trying to

  23. anonymous
    • 5 years ago
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    Well from the question you know that you are trying to solve for x and y but both of them have x and y in it which can be completely different so you want to essentially get a single variable x or y it doesnt matter in one equation and you solve for that one.

  24. anonymous
    • 5 years ago
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    that is exactly what we have been doing :)

  25. anonymous
    • 5 years ago
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    How can he understand what you are doing when he doesn't understand the concept. If you don't understand something and you work it out and find the answer it does no help since he is just memorizing it.

  26. anonymous
    • 5 years ago
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    x=4

  27. anonymous
    • 5 years ago
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    thanks

  28. anonymous
    • 5 years ago
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    Yeah you are right romero. We had a discution about that before :). Rich you finally did it. If you replace x and y into the one of the original equation you have both sides are equal. Well done dude

  29. anonymous
    • 5 years ago
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    thanks for the help

  30. anonymous
    • 5 years ago
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    That is the procedure you have to follow

  31. anonymous
    • 5 years ago
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    np

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