What is the equation of a line that has a y-intercept -1 and passes through the point (4,5)

If you want to find the equation of line with a given a slope of which goes through the point (4,5), you can simply use the point-slope formula to find the equation: 
---Point-Slope Formula---
where is the slope, and is the given point

So lets use the Point-Slope Formula to find the equation of the line

Plug in , , and (these values are given) 

Distribute  

Multiply and to get

Add 1 to both sides to isolate y 
Combine like terms and to get the answer
So the equation of the line with a slope of which goes through the point (4,5) is: 
which is now in y=mx = b form where the slope is m=4/5  and the y-intercept is b=1 

The answer would be 484