# How do you solve linear functions, f(x)=mx+b?

I should remember this from highschool but I don't. I can't learn from the book because I can't ask the book questions. I make math waaaay harder than it actually is. So hopefully someone here can help me get it to click in my brain, then all will be well.

Relevance

Linear functions aren't that difficult, but with a lousy book or teacher, it's harder than it should be.

Here's a good tutorial online=>

http://www.math.com/school/subject2/lessons/S2U4L3...

My pre-calculus teacher recommends this site:

http://www.geocities.com/ojjk/index.html

• Login to reply the answers
• M is slope, B is the Y-intercept. You plug in the values for Y and X, then solve for whatever variable you need.

If you have two points to work with you can find your slope with the equasion (y1-y2)/(x1-x2)

That will give you a fraction which simplifies into your slope.

• Login to reply the answers
• y= f(x) = mx + b

m = slope of the line

b = the point where the line intercepts the Y (vertical) axis i.e. when x=0

m=slope= rise/run of the line = change is y / change in x

you need values m and b to solve the equation otherwise all points of the line are of the format ((y-b)/m,mx+b)

• Login to reply the answers
• Anonymous

ok. the f(x) will be the y in your first ordered pair. m is the slope. to find the slope you use y2- y1 over x2-x1. then you will multiply the slope by the x in your first order pair. then you mult. the x and the m. Then subtract that 4rm y and that gives you your b. tada you got your linear function

Source(s): algebra and geometry
• Login to reply the answers
• m is the slope and b is the y-intercept. make a t-chart and just start plugging in numbers for x and see what you get for y or just plug it into a graphing calculator

• Login to reply the answers
• X Mx B

• Login to reply the answers
• by giving values to independent variables and finding the corresponding values of the dependent variables

• Login to reply the answers
• do u have a graphing calculator???? graph then 2nd "calc" and choose what u need.!!

• Login to reply the answers
• its not that hard...

• Login to reply the answers