slope algebra

posted by .

given ab and its midpoint m. the coordinates of a are (-10,-3) and the coordinates of M are (-4,-1)

a. find the coordinates of B.
b. find the slope of am. c. find the slope that is perpendicular
d. find the slope that is parallel
e . write the equation of AM



answers. please check?

a.
b. slope of am is 1/3
c. -3
d. 1/3
e. y=1/3x+b
plug in (-4,-1)
-1=1/3x+-4
x=9?
so y=1/3x+9?

  • slope algebra -

    let B(x,y) be the other point
    we know how to get the midpoint
    (x - 10)/2 = -4
    x-10 = -8
    x = 2

    (y+3)/2 = -1
    y+3 = -2
    y = -5

    coordinates of B are (2,-5)

    b) since the slope should be the same for BM , AB, and AM
    I will use the original values
    slope BM = -4/6 = -2/3
    (you will get the same answer for the others, don't know how you got 1/3)

    c) the slope of the perp. must be +3/2
    d) slope of parallel is -2/3

    e) since you slope is wrong, your answer is obviously wrong

    y = (-2/3)x + b
    (-4,-1) on it
    -1 = (-2/3)(-4) + b
    -1 = 8/3 + b
    b = -11/3

    y = (-2/3)x - 11/3

    BTW , you subbed the -4 in for the b instead of the x in your solution.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Graph problems!!!

    Ok. so i'm supposed to find the coordinates of a line using the slope intercept method but i don't understand it!!! can some one PLEEAASE help me?
  2. algebra

    Find the slope of the line through the given points. (2,4) (6,-3). m=y2-y1 over x2-x1. (-3)-(4) over(6)-(2) -3-4 over 6-2 -7 over 4. I plotted the two coordinates (2,-4) (6)(-3), and the slope is -7 over 4, right?
  3. math

    my question in (slope) find the coordinates of a quadrilateral so that the slope of all four sides are negative ?
  4. pre calculus

    Question 1: Explain why the equation of the line y=5 has a slope that is undefined. Explain in words or mathematically. Question 2: Given any circle, the coordinates of one endpoint of a diameter is (3,-2). If the coordinates of the …
  5. Algebra

    Not sure on a few of my answers, can you help?
  6. math

    find the equation (in slope intercept form) of the line with the given slope that passes through the point with the given coordinates slope:-5/8, ordered pair (0,1)
  7. math

    how do i find the slope of line AB if A`s coordinates are(-4,3) and B`s coordinates are (2,-1)
  8. geometry

    prove: the segment joining the midpoints of the two sides of a triangle is parallel to the third side. the coordinates are A(0,0)B(a,0)on the the x axis, and C(c,d), M is midpoint and the coordinates of M is (c/2,d/2) and N is also …
  9. calculus

    1. Given the curve a. Find an expression for the slope of the curve at any point (x, y) on the curve. b. Write an equation for the line tangent to the curve at the point (2, 1) c. Find the coordinates of all other points on this curve …
  10. Math

    I am really not understanding how to find the slope. I have a graph with the coordinates (-3,3) and (1,-5). If someone could help explain how to find the slope it would be greatly appreciated!

More Similar Questions