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keri

  • 3 years ago

can someone please tell me how to find the slope of a graph?

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  1. colorful
    • 3 years ago
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    what kind of graph? a line or a graph of some equation that curves?

  2. keri
    • 3 years ago
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    a line graph

  3. colorful
    • 3 years ago
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    I assume you are given a picture, or at least two points on the graph?

  4. keri
    • 3 years ago
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    yes something like this

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  5. colorful
    • 3 years ago
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    I see 5 points on that graph pick any two of those points (it doesn't matter which) and list out the coordinates like so: (x,y) write that out and I will tell you where to go from there

  6. keri
    • 3 years ago
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    :( can u do it let me see it

  7. keri
    • 3 years ago
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    how do i find coordinates?

  8. colorful
    • 3 years ago
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    I will give you one: at x=1, notice that if you follow the blue dot above it to the left you get the y-coordinate which is 10

  9. colorful
    • 3 years ago
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    so that point on the upper-right corner is (1,10)

  10. colorful
    • 3 years ago
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    that means that when x=1, y=10 find another point using the same method

  11. keri
    • 3 years ago
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    x=-2,y=5 ?

  12. colorful
    • 3 years ago
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    careful, I think it's x=-2,y=-5 notice we are below the x-axis, and whenever that is the case y is negative

  13. colorful
    • 3 years ago
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    so now we have two points let's call them (x1,y1) and (x2,y2) it does not matter which is which (-2,-5) and (1,10) are our points

  14. colorful
    • 3 years ago
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    given two points on a line, (x1,y1) and (x2,y2) the slope is given by\[slope={y_2-y_1\over x_2-x_1}\]so just plug in the numbers into the formula and you get the slope

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