y = mx + b
slope(m) = -4/5
(5,1)...x = 5 and y = 1
now we sub into the formula and find b, the y int
1 = -4/5(5) + b
1 = -4 + b
1 + 4 = b
5 = b
so ur equation is : y = -4/5x + 5...but we need it in standard form..
y = -4/5x + 5....add 4/5x to both sides
4/5x + y = 5...now multiply by common denominator 5
4x + 5y = 25 <== standard form
