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The formula for a line can look like this|dw:1437333815430:dw|
The only thing we need to do is figure out what y1, x1 and m is.
I do not understand the formula though :/
Well if we figure out these three numbers we can plug them in, simplify and we'll have our answer |dw:1437333928564:dw|
When you say plug in numbers do you mean guessing them?
Nope we need to calculate them based on the two points given. "m" represents the slope of a line. If you are given two points the best way to fin the slope is to calculate "the change in y"/"the change in x"
What do you mean by that change in Y and X?? Sorry if I sound clueless :/
(2, 8) and (4, 12) are our points. Whenever we see two number in parenthesis separated by a comma this is telling us where a point is located on a graph. the first number tells us how far over to go left and right (your x value). The second number tells us how far to go up and down (your y value). |dw:1437334303980:dw| To get to point (2,8) you would start at the origin go over 2 spaces then up 8. |dw:1437334574867:dw| If you have two points, to get from one to another you also need to go over by a certain amount and up by a certain amount. |dw:1437334702484:dw| In this case, to get from the first point to the second, we have to go over 2 and up 4 See y goes from 8 to 12. 12 - 8 = 4 so change in y is 4 x goes from 2 to 4. 4-2 = 2 so change in x is 2 change in y/ change in x = 4/2 4/2 = 2 so m = 2
Sorry I resent that message
Okay but It askes me which best represents and equation not the answer
Yes yes we are getting there, whats more important however than finding the answer is for you to develop an understanding that way you can find all the rest of the answers by yourself!
Do you understand how I got m?
You had changed Y and then X=4/2 so then 4/2 equals 2 so M=2
awesome! now you know how to find "m" or "slope" if given two points! the only other things we need is y1 and x1 Well thats easy, y1 is the y value of the first point and x1 is the x value of the first point.
What is the y value of (2,8) ?
Okay so would I divide 4,12 by 2 or something?
lol sorry wrong number
What is the y value of (2,8) ?
*hint* i explained this and gave you the answer earlier in this thread ;)
Okay but Idk how you find that?
Whenever we see two number in parenthesis separated by a comma this is telling us where a point is located on a graph. the first number tells us how far over to go left and right (your x value). The second number tells us how far to go up and down (your y value).
Ohhh Y is 4
change in y is 4
But the y value of the point (2,8) is simply 8
so y1 = 8
what is the x value of the point (2,8) ?
I thought x was 4,12?
Wait X is 2
x1 = 2
So if we recall: m=4 y1=8 x1=2
:o would this be C?
Now all we need to do is put those numbers into this equation: |dw:1437336182607:dw|
:/ It is the only one that has 4 in the answer and 2
And Y equals 4
x1 equals 2
All you need to do now is simplify this equation|dw:1437336341302:dw|
Add 8 to both sides and you are done
oops im sorry m = 2
Wait on the equaton that is represented black?
add 8 to both sides
So the answer is C
Yay thank you