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froghead
Lv 5
froghead asked in Science & MathematicsMathematics · 1 decade ago

Did I get the right answer to this problem?

The question is two parts

A. Find the slope of the line that passes through these two points (7,2) (9.-1)

B. Find the equation of the line that passes through those two points.

I got M= -3/2 for A

and got Y=-3/2x+17/2 for B

Update:

Thanks for the help, see my mistake now. Will post a best answer

4 Answers

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  • BantuPandu
    1 decade ago
    Favorite Answer

    Almost

    Y=-3/2x+25/2

    putting 17/2 gives you a -2 not a positive

    i plugged in (7,2)

    Best Answer?

    Source(s): AP CALCULUS
  • ?
    Lv 7
    1 decade ago

    A. Use the "rise over run" method to find the slope: (y2 - y1) / (x2 - x1).

    x1 = 7; y1 = 2; x2 = 9; y2 = -1, so m = (-1 - 2) / (9 - 7) = -3/2.

    Your answer is indeed correct.

    B. Since you computed the slope in part A, you can use the point-slope form of the equation of a line:

    y - y1 = m(x - x1).

    y - 2 = (-3/2)(x - 7), or

    y - 2 = -(3/2)x + 21/2, or

    y = -(3/2)x + 25/2.

  • mohanrao d
    Lv 7
    1 decade ago

    First part is right

    second part - eqn of line is y = -(3/2)x + 25/2

  • Anonymous
    1 decade ago

    A/ ok

    B/ no

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