Question 756267
Use coordinates (4,2) and (-2,4) to find gradient (m)
Formula = y2 - y1/x2 - x1 = 4 - 2/-2 -4 = 2/-6 = -1/3
Using (4, 2) m = -1/3 and the formula => 
(You can use either set of the coords. (4,2) or (-2,4)) 
y - b = m(x - a)   (a and b are x and y of coords)
             y - b = m(x - a)
             y - 2 = -1/3(x - 4)
Multiply out:
             y - 2 = -1/3x + 4/3
Convert 2 to 6/3
                 y = -1/3x + 4/3 + 6/3
                 y = -1/3x + 10/3

You can multiply through by 3 to remove fractions:
                 3y = -x + 10
Hope this helps
:-)