Answer:
see below
Explanation:
y=mx is the start of a line equation. The line equation is:

with m being the slope and b is the y-intercept.
If you have 2 points, let's say (0,1) and (4,0), the slope would be -1/4.
The slope is
. The rise is the number of units going up or down from one point to another. The run is the number of units going left or right from one point to the other.
In this case, the slope is -1/4 because you go down 1 unit and right 4 units.
The y-intercept is 1 because the y-intercept is when x=0 and is located on the y-axis.
Hope this helps :)