math

posted by student that needs help asap

What is the equation of a line that is perpendicular to 2x+y=−4 and passes through the point (2, −8)


my answer:
1/2x-9


AM I CORRECT OR NO ???

  1. student that needs help asap

    i mean y=1/2x-9

  2. Reiny

    nope, your slope is right, but when I substituted x = 2, I got
    y = (1/2)(2) - 8
    = 1 - 8
    = -7

    so the point does not lie on your line.

    Furthermore, since the original equation was written in standard form, I think the same style of equation would be expected.

  3. student that needs help asap

    so its y=1/2x-7?

  4. Reiny

    Your equation was correct.
    For some reason I wrote down your equation as
    y = 1/2x-8 to do my calculation,

    and I then carried through the calculations with my typo.

    yes, it is y = (1/2)x - 9

  5. student that needs help asap

    thnk you !

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