Richard C. answered 03/16/23
Confidence-building Geometry tutor with 18 years experience
The parallel line must have a slope of -2. Now we just use (4,5) to calculate the y-intercept.
y = mx+b
y = -2x+b
at (4,5) we get 5 = -2(4) +b which gives b=13
So the equation is y = -2x+13