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anonymous

  • 5 years ago

What is the equation of the line:

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  1. anonymous
    • 5 years ago
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  2. anonymous
    • 5 years ago
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    y=mx+c From the graph we can see that the y-intercept is -2 To find the gradient, pick two point and enter it into this equation \[m=\frac{y_2-y_1}{x_2-x_1}\]

  3. anonymous
    • 5 years ago
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    so do i divide

  4. anonymous
    • 5 years ago
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    for the gradient or slope? yes

  5. anonymous
    • 5 years ago
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    which 2 points should i pick

  6. anonymous
    • 5 years ago
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    it doesn't matter which they will all give you the same slope.

  7. anonymous
    • 5 years ago
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    is 3 correct

  8. anonymous
    • 5 years ago
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    Yes it is. So what is your equation?

  9. anonymous
    • 5 years ago
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    idk i'm lost

  10. anonymous
    • 5 years ago
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    Okay so you have worked out your slope which is 3 and we know the y-intercept (occurs at x=0) from looking at the graph and it was -2. This means m=3 and c=-2. The equation of a straight line is y=mx+c. All you have to do is place the values into the equation. What do you get?

  11. anonymous
    • 5 years ago
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    4.5

  12. anonymous
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    -4.5

  13. anonymous
    • 5 years ago
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    Ahh okay, y=mx+c, m=3 and c=-2. The equation of the line is then y=3x-2. And that is the answer

  14. anonymous
    • 5 years ago
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    ty

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