A line in is given by the equation
is the of the line and b
is the . The line y=9x+4
has a y
-intercept of (0,4).
We want our line to have the same y
-intercept. Therefore, the equation of the new line must also have the value b=4.
Our line must also pass through the (3,1).
We can solve for m
in the equation above by substituting this point for x
The slope of the new line is m=-1.
Thus, we can write the complete equation as