When you are
graphing the equation y = mx + b
(or - b, it doesnt matter), you need to first find one of the
intercepts. It
is easiest to find the y intercept because the equation is set up to show it
clearly. To find the y intercept, you set x to 0, which will result in y = b. B is
always the y
intercept (if it is positive, it is above the x axis, if it is
negative, it is below it). You
may plot this point on the map by placing a
dot at the point b on the y axis.
From there, you must
find the slope, which is what m stands for. The slope is defined
as rise over
run, meaning the value of m is a fraction with the number of steps up on top
and
the number of steps to the right or left on the bottom. If the number is
a whole number, such as
3, the rise is that number and the run is 1. If the
value is negative, you travel to the left
instead of to the right for the
run. Graph the next point by counting up and over for the rise
and run from
the y intercept. Once you have two points plotted, you can draw a straight
line
through them and continuing to the edges of the
graph.
No comments:
Post a Comment