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anonymous

  • 4 years ago

can anyone help me solve 2 problems with substitution? :)

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  1. anonymous
    • 4 years ago
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    2 = 2y - x 23 = 5y - 4x

  2. Rogue
    • 4 years ago
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    If you rearrange the first equation, you can get: x = 2y - 2 You can then plug that into the x in the second equation. 23 = 5y - 4(2y - 2) Then just solve that for y. After you get y, plug y back into x = 2y - 2 to get your x value. After you have both the x and y values, your done!

  3. anonymous
    • 4 years ago
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    thank you! i got -12, -5

  4. Rogue
    • 4 years ago
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    Good job :)

  5. anonymous
    • 4 years ago
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    & i also have a last problem like that

  6. anonymous
    • 4 years ago
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    if you have time:)

  7. Rogue
    • 4 years ago
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    Sure, hit me.

  8. anonymous
    • 4 years ago
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    The measure of one acute angle in a right triangle is four times the measure of the acute angle. Write and solve a system of equations to find the measure of the acute angles.

  9. Rogue
    • 4 years ago
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    Alright, so what do you know about the total degree measure of a triangle? The degree measure of a right angle?

  10. anonymous
    • 4 years ago
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    180 & 90

  11. Rogue
    • 4 years ago
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    Alright, good. Total angle measure = angle 1 + angle 2 + angle 3. 180 = 90 + angle 2 + angle 3 90 = angle 2 + angle 3 So the sum of the two acute angles is 90 degrees.

  12. anonymous
    • 4 years ago
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    yess:)

  13. Rogue
    • 4 years ago
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    If you let x = measure of the smaller acute angle, what is the measure of the bigger acute angle?

  14. anonymous
    • 4 years ago
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    that's the part i don't understand.

  15. Rogue
    • 4 years ago
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    Well, the bigger acute angle is 4 times as much as the smaller one. Small acute angle = x Big acute angle = 4x

  16. Rogue
    • 4 years ago
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    And their sum is 90 degrees, so 90 = x + 4x

  17. anonymous
    • 4 years ago
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    ohh!

  18. Rogue
    • 4 years ago
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    You can do the rest right? :)

  19. anonymous
    • 4 years ago
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    yes thank you!! :) i wish i had your brain lol

  20. Rogue
    • 4 years ago
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    Haha, thanks, don't worry, you'll get there :)

  21. anonymous
    • 4 years ago
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    and one more question, but short

  22. anonymous
    • 4 years ago
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    x + 3 = y 3x + 4y = 7 so that would be; 3x + 4(x + 3) = 7 ?

  23. Rogue
    • 4 years ago
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    Yep, nice :)

  24. anonymous
    • 4 years ago
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    thanks! :)

  25. Rogue
    • 4 years ago
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    For systems, just try to find a way to substitute one equation into the other.

  26. anonymous
    • 4 years ago
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    Okay! thank you:D

  27. Rogue
    • 4 years ago
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    Good luck with the rest, byes. :)

  28. anonymous
    • 4 years ago
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    byee:)

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