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EmmaH Group Title

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

  • one year ago
  • one year ago

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  1. AriPotta Group Title
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    change it to slope-intercept form first

    • one year ago
  2. EmmaH Group Title
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    -2y=-4x+8?

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

    • one year ago
  4. EmmaH Group Title
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    y=2x+-4

    • one year ago
  5. AriPotta Group Title
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    y = 2x - 4*

    • one year ago
  6. AriPotta Group Title
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    so now you can tell what the y intercept is. what is it?

    • one year ago
  7. EmmaH Group Title
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    what is a y intercept?

    • one year ago
  8. AriPotta Group Title
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    :l

    • one year ago
  9. elisichi Group Title
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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.

    • one year ago
  10. EmmaH Group Title
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    ok what makes it a y intercept?

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

    • one year ago
  12. EmmaH Group Title
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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)

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

    • one year ago
  14. elisichi Group Title
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    Yes I would assume so!

    • one year ago
  15. EmmaH Group Title
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    i have a computer block thing i cant watch videos sorry=(

    • one year ago
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