## anonymous 4 years ago I don't understand Linear Functions. This is what it states write the rule for the linear function. x y -3 -17 -1 -7 1 3 3 13 using (1,3) and (3,13): m=______=_______=_______ How do I figure this out?

1. anonymous

y=mx+c where c is the y-intercept and m is the gradient. $m=\frac{y_2-y_1}{x_2-x_1}$

2. anonymous

how did you get that? I'm a big dummy lol

3. anonymous

These are the rule to find out the equation of a straight line. All you need to do to find the gradient is plug in the values for the two points.

4. anonymous

ok so if I'm looking at the graphand I'm using 1,3 and 3,13 then the m= what? see I don't get it. When I look at the graph I see where the 1,3 is but I don't get how to make the m= anything

5. anonymous

(1,3) --> (x1,y1) and (3,13) ---> (x2,y2) So $m=\frac{y_2-y_1}{x_2-x_1}$$=\frac{13-3}{3-1}$$=\frac{10}{2}$$=5$