Hi
graph the line containing the given pair of points and find the slope
Using the point-slope formula, 
(-1,7) and
(2,4) m = (7-4) / (-1-2) = 3/-3 = -1
y = -x + b |Using ordered pair Pt(2,4) to find b
4 = -2 + b
6 = b | y = -x + 6 OR standard form: x+ y = 6
