Question

How do I find the equation for a line on a graph?
Either an explanation or a link to an explanation would be appreciated! Thanks.

Answer 1

Do you have the graph?

Answer 2

No, but I have two points. (8,3) and (4,3)

Answer 3

what is the slope of the line through those points?

Answer 4

Erm... heh. I don't know? Sorry...

Answer 5

you would use the slope formula

\[\Large m = \frac{y_{2}-y_{1}}{x_{2}-x_{1}}\]

Answer 6

(x1,y1) is your first point
(x2,y2) is your second point

Answer 7

So m=0/-4?

Answer 8

which reduces to 0

Answer 9

the slope of m = 0 means that we have a completely flat horizontal line

Answer 10

now we turn to y = mx+b

Answer 11

m = 0

Answer 12

x and y are from either point you pick

so let's say you pick (8,3) that means x = 8 and y = 3

Answer 13

so...

y = mx+b

3 = 0*8 + b

b = ???

Answer 14

b=3

Answer 15

Right?

Answer 16

m = 0 and b = 3


y = mx+b

y = 0x + 3

y = 3

Answer 17

so the final answer is y = 3

Answer 18

Okay, thank you! :)

Answer 19

you're welcome