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anonymous
 one year ago
I have a question about the slope....
In the slope formula y=mx+b what is the difference between the y and the b and how do I know when to plug it in to the y or b?
anonymous
 one year ago
I have a question about the slope.... In the slope formula y=mx+b what is the difference between the y and the b and how do I know when to plug it in to the y or b?

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Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1b is yintercept a point where line cross yaxis(there would be only one ) y = just ycoordinate you don't need to plug anything for y

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Example problem: Line A has slope of 5/3 and passes through the point (2,7). WHat is the xintercept of line A?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1yes y=mx+b so replace m with 5/3 y=5/3x+b now you have x y value (2,7) x=2 y=7 substitute x and y for their solve for b(yintercept )

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I just don't understand what to plug into the y or b.... like if they ask it passes through the line then what do i do? use it for the y or b?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1xintercept is a point where line cross the xaxis when y =0 after you find yintercept substitute y for 0

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Like what are some examples of when i have to use it for y or b? what do they have to say for me to know where to replace it?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1when they say passes through the points (x,y) then you have to find b

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so replace the b with the number they say it passes through the points?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1replace with y not b (b is yintercept )

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1here is an example slope =2 passes through (4,3) \[\huge\rm \color{reD}{y}=mx+b\]\[(4,\color{ReD}{3})\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So in what cases do i replace the b (yintercept) what kind of problems do they have to ask for

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1then statement would be like this slope is 3 and ***YINTERCEPT =5

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1they would use the *yintercept ) word

phi
 one year ago
Best ResponseYou've already chosen the best response.0maybe this helps??: y = 3x + 2 is a formula to "find y" if you are told x. you then put the x and y together as a package (x,y) for example, if x is 1, y will be 5 (do you see how?) and (1,5) is the "package" which is just a way to say the point (1,5) is on the line. does that part make any sense?

phi
 one year ago
Best ResponseYou've already chosen the best response.0the next idea is we can (in theory) find all the points on the line using its formula that can be useful and the reason we want a formula rather than a long boring list of (x,y) pairs

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0hmmmm i mean thats easy i'm just hving a hard time understand when to substitute the y or b

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1dw:1439238885626:dw i know why you r confused but yintercept is the specific point where line cross the yaxis which is also one of the y value but they will always use the yintercept word for b

phi
 one year ago
Best ResponseYou've already chosen the best response.0you will get the idea... but I want to make sure you got the basic idea the next idea is how do we find the formula for a line? it turns out you need just two points on the line, and there is a way to do that.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0what if they don't specifically use the term yintercept like how will i know to plug what in where?

phi
 one year ago
Best ResponseYou've already chosen the best response.0as you know, the formula for a line is y= m x + b where m is the slope and b is the "yintercept" if you are given two points, they you know how to find the slope, right ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.02 points like (5, 2)? yea then just plug in 5 to x and 2 to b right?

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1when they say given points where (3,5) where first number represent xcoordinate and and 2nd number represent the ycoordinate (NOT yintercept )

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1ycoordinate =y yintercept = b

phi
 one year ago
Best ResponseYou've already chosen the best response.0**2 points like (5, 2)? *** oooh! no! a point is (x,y) pair. (5,2) is one point. to find it, you go over 5 and up 2 to get to it.

phi
 one year ago
Best ResponseYou've already chosen the best response.0two points would be for example (1,3) and (4,4)

phi
 one year ago
Best ResponseYou've already chosen the best response.0yes, you can do that. but the first step is to find m (which we can do) change in y divided by change in x what do you get for m ?

phi
 one year ago
Best ResponseYou've already chosen the best response.0yes, and for (1,3) and (4,4) what do you get for m?

phi
 one year ago
Best ResponseYou've already chosen the best response.0ok. now we go back to the equation 3=m(1)+b and put in m= 1/3 3= 1/3 * 1 + b or 3= 1/3 + b sorry about the ugly numbers... but we can solve for b by adding 1/3 to both sides.

phi
 one year ago
Best ResponseYou've already chosen the best response.0you get b= 3  1/3 or 8/3 notice if we start with y = 1/3 x + b and put in the other point (4,4) 4 = 1/3 * 4 + b 4= 4/3 + b 4 4/3 = b and b= 12/3  4/3 = 8/3 we get the same b

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yea i know about that u'll always get the same solution no matter which u plug in

Nnesha
 one year ago
Best ResponseYou've already chosen the best response.1\(\color{blue}{\text{Originally Posted by}}\) @yomamabf 2 points like (5, 2)? yea then just plug in 5 to x and 2 to b right? \(\color{blue}{\text{End of Quote}}\) also when the statement is *passes through point * that means solve for b easy way to memorize it ;)

phi
 one year ago
Best ResponseYou've already chosen the best response.0if you are given two points, you find the equation of the line by 1) find the slope 2) use either (x,y) pair to replace the x and y in the equation with numbers and solve for b does that sound ok?

phi
 one year ago
Best ResponseYou've already chosen the best response.0if you are told the yintercept is 3 (for example) that is the same info as telling you that (0,3) is a point on the line (yintercept is the y value when x is 0)

phi
 one year ago
Best ResponseYou've already chosen the best response.0say the problem was: slope is 3 y intercept is 3 what is the equation? two ways to do it: y = mx + b we are told m is 3, so y= 3x + b (0,3) is a point on the line 3= 3*0 + b 3 = b so y= 3x+3 the other way: replace m with 3 (the slope), and replace b with 3 (the yintercept) y = 3x+3

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yea i was thinking the latter

phi
 one year ago
Best ResponseYou've already chosen the best response.0yes, but it is good to see how to do it the first way. It always helps to see problems solved in different ways.

phi
 one year ago
Best ResponseYou've already chosen the best response.0the first way is how you do it for any point on the line. (0,3) is just an easy point (because it tells us what b is ... or multiplying x by 0 is easy)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay i'm going to try to find another problem and see if i can do it by myself i need practice =(

phi
 one year ago
Best ResponseYou've already chosen the best response.0if you get lost, post the problem
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