Question 166546
*[invoke slope 4, 2, -2, 5]

use y-k=m(x-h) where (h,k) is any point on the line(4,2) and m is the slope

y-2=m(x-4)----->y-2=-1/2(x-4)---->y-2=-1/2x+2---mult by 2

2y-4=-x+4---->{{{x+2y=8}}}