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anonymous

  • 5 years ago

identify the point of intersection, using one of the following methods: Elimination, subsitiution, graphing X starts at 0 and goes up by 10 each rep for up to 15 reps To find y for the first its .4(X)+50 To find y for the second line its 4.4(X)+0

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  1. myininaya
    • 5 years ago
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    what is rep?

  2. anonymous
    • 5 years ago
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    repetition so it goes up by 10 15 times

  3. myininaya
    • 5 years ago
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    so are you saying the equations are: y=.4x+50 and y=4.4x ?

  4. anonymous
    • 5 years ago
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    yes

  5. myininaya
    • 5 years ago
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    ok yes so i don't have to read that rep stuff lol

  6. anonymous
    • 5 years ago
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    idk but its within 8-12 bottles

  7. anonymous
    • 5 years ago
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    yes its 10 bottles bottles are the item we are making a graph on and x = bottles

  8. anonymous
    • 5 years ago
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    no its not ten =0

  9. myininaya
    • 5 years ago
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    just set 4.4x=.4x+50 4.4x-.4x=50 4x=50 x=50/4 x=25/2 so y=4.4x=4.4(25/2)=44/10(25/2)=22/5(25/2)=5(11)=55 so they intersect at (25/2,55)

  10. anonymous
    • 5 years ago
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    what?

  11. anonymous
    • 5 years ago
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    hey derp u just saw my question bt i asked u something can u please answer me please

  12. myininaya
    • 5 years ago
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    to find where they intersect all i did was set the two lines equal to each other i want to find the x when the two lines are the same (so the equal sign means that) and i solved for x and then it didn;t matter which line i used after that to find y both lines would give me the same y

  13. myininaya
    • 5 years ago
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    yes i just replaced that one y with y=4.4x substitution

  14. anonymous
    • 5 years ago
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    would i get full credit for expaining work also what is the function of the two

  15. myininaya
    • 5 years ago
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    in the directions about it said to find the intersection it is (25/2,55) i don't know what you mean by the function of the two?

  16. anonymous
    • 5 years ago
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    ok its function for 1st line and function for 2 and if the points matter two of them from each are (1) 10,52 20,54 (2) 10,44 20, 88

  17. anonymous
    • 5 years ago
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    hey derp answer me please

  18. anonymous
    • 5 years ago
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    ok while hes looking at mine ill help u

  19. myininaya
    • 5 years ago
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    wait are you saying for the first line the some of the ordered pairs are {(10,52),(20,54)} 2nd line {(10,44),{20,88)} ?

  20. anonymous
    • 5 years ago
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    by the scale they gave us these are for each 10 bottles but for the second part which i started the question it is ok because plugin them into a graph got around what you said.

  21. anonymous
    • 5 years ago
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    we were told to go by 10

  22. myininaya
    • 5 years ago
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    the above are some of the ordered pairs on the line right? you are trying to get me to check your lines, correct?

  23. anonymous
    • 5 years ago
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    the function is what im clueless about and i think it has some relation with that right?

  24. myininaya
    • 5 years ago
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    are the following ordered pairs on a line: (10,52) and (20,54) are the following ordered pairs on the other line: (10,44) and (20,88)?

  25. anonymous
    • 5 years ago
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    yes

  26. anonymous
    • 5 years ago
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    So?

  27. myininaya
    • 5 years ago
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    ok so since we know two points on the first line, the slope is \[\frac{54-52}{20-10}=\frac{2}{10}=\frac{1}{5}\] so we have y=1/5*x+b we need to know the y-intercept which we are calling b in the line before we know a point on the line (10,52) x=10 and y=52 so 52=1/5*10+b we can solve for b 52=2+b 50=b so the equation of line 1 is y=1/5*x+50 now second line we know two points on it as well so we can find the slope the slope is \[\frac{88-44}{20-10}=\frac{44}{10}=\frac{22}{5}\] so we have y=22/5*x+b we know a point on this line so we can find the y-intercept which we called b in the line before x=10 y=44 44=22/5*10+b so we can solve for b 44=22(2)+b 44=44+b b=0 so the equation of the line is y=22/5*x

  28. myininaya
    • 5 years ago
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    so we have Line 1: y=1/5*x+50 and Line 2: y=22/5*x 22/5*x=1/5*x+50 (by substitution) 22/5*x-1/5*x=50 21/5*x=50 x=50*5/21 x=250/21

  29. myininaya
    • 5 years ago
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    so y=22/5*250/21=1100/21

  30. anonymous
    • 5 years ago
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    so the 25/2,55 changed?

  31. myininaya
    • 5 years ago
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    so the point of intersection is (250/21,1100/21)

  32. myininaya
    • 5 years ago
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    yes we have different lines so the point of intersection will be different

  33. anonymous
    • 5 years ago
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    are you sure its not closer because on the graph i made its near the start

  34. myininaya
    • 5 years ago
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    ? i found the lines by the ordered pairs you gave me those ordered pairs lie on those two lines right with (10,52) and (20,54) lying on one line and with (10,44) and (20,88) lying on the other?

  35. anonymous
    • 5 years ago
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    yea but 10 is 10 of x you can plug 1,2,3,- 150

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