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ccchristian1

  • one year ago

A pair of equations is shown below: y = 8x − 9 y = 4x − 1 Part A: Explain how you will solve the pair of equations by substitution or elimination. Show all the steps and write the solution. (5 points) Part B: If the two equations are graphed, at what point will the lines representing the two equations intersect? Explain your answer. (5 points)

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  1. ccchristian1
    • one year ago
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    @Trinity_haha

  2. anonymous
    • one year ago
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    I have no clue ;-; Try tagging so of the mods and ambassadors.

  3. ccchristian1
    • one year ago
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    @ambassadors

  4. anonymous
    • one year ago
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    @nincompoop @Preetha @pooja195 @triciaal

  5. UsukiDoll
    • one year ago
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    k that's enough.. anyway for a we can just use substitution.

  6. UsukiDoll
    • one year ago
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    suppose we have two equations y=8x-9 and y=4x-1. If we subsitute y =4x-1 into the first equation, we obtain 4x-1=8x-9 we need all the variable terms on the left side of the equation and all of the constant terms on the right side of the equation. Therefore, subtract 8x from both sides and add one on both sides 4x-8x-1=8x-8x-9 -4x-1 = -9 -4x-1+1 = -9+1 -4x = -8 dividing -4 on both sides we obtain x = 2 -4x = -8 ----- ----- -4 -4 x = 2 now to check to see if we got the right answer we substitute x = 2 back into the original equations y=8x-9 and y=4x-1. y = 8(2) - 9 = 16-9 =7 y=4(2)-1 = 8-1 = 7 Both of our y values are 7 7 = 8x -9 7 = 16-9 7=7 7 = 4x-1 7=8-1 7=7 Since we have 7 on both sides when x = 2, we have the correct answer.

  7. ccchristian1
    • one year ago
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    wow thank you

  8. UsukiDoll
    • one year ago
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    as for part B I think I have already done it.. when two equations intersect, they have a point in common If we let x = 0 1 2 for y=8x-9, we have x y =8x-9 0 -9 1 8-9 = -1 2 16-9 = 7 Similarly, for y =4x-1 x y =4x-1 0 -1 1 4-1 =3 2 8-1 = 7 both of these equations have the point (2,7) in common. So the two lines will meet at point (2,7) . I would draw on OS, but lately their drawing system has been going nuts.

  9. ccchristian1
    • one year ago
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    okay thank you

  10. ccchristian1
    • one year ago
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    thanks so much

  11. UsukiDoll
    • one year ago
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    :)

  12. UsukiDoll
    • one year ago
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    you can use what I typed on here xD!

  13. ccchristian1
    • one year ago
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    yeah i am lol

  14. ccchristian1
    • one year ago
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    you got more time, i will post the other question in a different post so you can earn snother medal

  15. ccchristian1
    • one year ago
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    another medal*

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