please keep up m = [(1/2)(5/5) - (4/5)(2/2)] ÷ [(3/2)(5/5) - (1/5)(2/2)] m = [(5/10) - (8/10)] ÷ [(15/10) - (2/10)] m = (-3/10) ÷ (13/10) m = -30/130 m = -3/13 ... m is the gradient.
using the format y = mx + c ... we already found m so now we'll find see using the point [4/5,1/5]
(1/5) = (-3/13)(4/5) + c (1/5) = (-12/65) + c (1/5) - (-12/65) = c (1/5)(13/13) + (12/65) = c (13/65) + (12/65) = c 25/65 = c 5/13 = c finally the equation is y = (-3/13)x + (5/13)
