Math

posted by .

I cannot remember how to find the slope of a line when you are given two points.
Here is the problem.

The slope of a line through (2,1) and (5,n) is 3. n=___

I ended up with -2. But I don't think that is the right answer. I put the points in slope-intercept form and solved for y, which would end up being n, right?
y(or n)=5x+3
y(1)=2x+3 [x equals -1 right?]

I'm so confused. . . .

  • Math -

    How would you find slope if you knew all of the two points

    just set

    (n-1)/(5-2)=3
    n-1 = 9
    n = 10

    test is by finding the slope, it works

  • Math -

    the method you tried will work, but you made an error.

    here is how it would have looked:

    let y = mx + b, but we have a point (2,1) and m=3
    1 = 3(2) + b
    b = -5

    so the equation is y = 3x - 5

    now sub in (5,n)
    n = 3(5) - 5
    n = 10

    much longer and more complicated, you must agree.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. 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?
  2. math, correction

    bobpursley. i'm still questioning the problem states find the slope of any line perpendicualr to the line through points (3,3) and (2,8). y= (8-3)/(2-3) the slope i get is. (5)/(-1) for the first slope now to get any line perpendicular …
  3. math

    I need help with slopes and lines. Determine the slope of each line a line through points (-1, 2) and (2, -7) Slope of a line through two points (x1, y1) and (x2, y2) is (y2 - y1)/(x2 - x1). So substituting the given points we have …
  4. Algebra

    Find the slope of any line perpendicular to the line through the points (0, 5) and (-3, -4). Show work Find the slope of the line through the two points: slope= (y2-y1)/(x2-x1) you do that. Now the slope of the line perpendicular to …
  5. algebra

    Find the slope of any line perpendicular to the line through points (0,5) and(-3,-4). I found the slope to be 3, but would the answer to the question be -1/3 ?
  6. Math/Algebra do u know how to do slope intercept?

    The following problems are in slope,point slope, and slope intercept forms of a line. Could you check these thanks. Find the slope intercept form of a line that passes through these two points (-4,4) and (2,1) Answer: y= -1/2x-2 Find …
  7. math

    i have more than one question so if u no any of the answers please tell me 1.) write the point-slope form of the equation of the line with slope -2 passing through the point ( -5, -9). 2.) write the point-slope form of an equation …
  8. math

    1. What is the slope of the line that passes through the points (-2, 5) and (1, 4)?
  9. Math

    Can someone please check my work? Write the slope-intercept (y = mx +b) form of the equation from the information given. 1. Slope = ½ and b = -3 Y=1/2-3 2. Slope equals 2 and the line goes through the point (-1, 3) Y=2x+5 3. The line
  10. Algebra 1 help

    Can someone tell me if my answers are right and explain how you got each one thank you very much ! 1. What is the slope of the line that passes through the points (-2, 5) and (1, 4)?

More Similar Questions