Question

The slope-intercept equation of the line through the points (8,4) and (9,4) is
y = mx+b

what is M ? and what is B ?

Answer 1

Insert those two points as (x,y) and solve the resulting system of linear equations for m and b.

Answer 2

im not sure how to get it, i got 4 for b , but how do i get m?

Answer 3

Solve the equation after you insert any point and 4 for b.

Answer 4

you can get m by subtracting y1 from y2 over x1 from x2

Answer 5

ok thanks

Answer 6

you get b AFTER you get the slope

Answer 7

ack!! that and it a straight line by the coordinates lol

Answer 8

the slope of a horizontal line is 0... so the equation is:

y = 0x +4

y = 4

Answer 9

ok that makes sense, so m=0

Answer 10

yes, m=0 :)

Answer 11

ok so how would i do this one, (5.1,-2.3) and (-3.5,3.7) . whats the first thing i should do?

Answer 12

first thing is to figure out the slope.. slope is defined by how steep the line rises.


y1 -y2
slope = -------
x1 -x2

Answer 13

-2.3 - (3.7)
----------
5.1 -(-3.5)

Answer 14

-6
--- is what I get if I added it right :)
8.6

Answer 15

ok, yea thats right

Answer 16

we can reduse that to make it easier to see:

-6/8.6 = -60/86 = -30/43

Answer 17

ok

Answer 18

now stick that slope into your equation for the line:

y = mx + b

y = (-30/43)x + b

Answer 19

ok thanks that makes more sense

Answer 20

pick any of the points they gave you and stick them in for x and y

(x =-3.5, y=3.7)

3.7 = (-30/43)(-3.5) + b

now solve for b

Answer 21

ok thanks!!

Answer 22

youre welcome.

Answer 23

m is the slope and b is the y intercept, i.e the point lying on y axis