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EmmaH

  • 3 years ago

please explain thi i dont get it:( Which of the following are the x and y intercepts of the equation 4x - 2y = 8?

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  1. AriPotta
    • 3 years ago
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    change it to slope-intercept form first

  2. EmmaH
    • 3 years ago
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    -2y=-4x+8?

  3. AriPotta
    • 3 years ago
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    divide everything by -2, then you'll be in slope-intercept form

  4. EmmaH
    • 3 years ago
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    y=2x+-4

  5. AriPotta
    • 3 years ago
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    y = 2x - 4*

  6. AriPotta
    • 3 years ago
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    so now you can tell what the y intercept is. what is it?

  7. EmmaH
    • 3 years ago
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    what is a y intercept?

  8. AriPotta
    • 3 years ago
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    :l

  9. elisichi
    • 3 years ago
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    Basically, what you do is you change it to y=mx+c first. If we rearrange it like that, it'd look like this: \[y=2x-4\] Then you know that the y-intercept is -4. To find the x-intercept, you make y=0 and solve for x. \[0=2x-4\] \[4=2x\] \[x=2\] So the y-intercept is -4 and the x-intercept is 2.

  10. EmmaH
    • 3 years ago
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    ok what makes it a y intercept?

  11. elisichi
    • 3 years ago
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    We know that when y=mx+c. C is always the y-intercept and m is the slope :)

  12. EmmaH
    • 3 years ago
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    ok so the answer is the last one?(3, 0) and (0, 4) (2, 0) and (0, 4) (-2, 0) and (0, -4) (2, 0) and (0, -4)

  13. phi
    • 3 years ago
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    Here is a short video http://www.khanacademy.org/math/algebra/linear-equations-and-inequalitie/v/x--and-y-intercepts

  14. elisichi
    • 3 years ago
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    Yes I would assume so!

  15. EmmaH
    • 3 years ago
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    i have a computer block thing i cant watch videos sorry=(

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