geometry
posted by lindsay .
The points A=(1,1) B=(3,4) connects to point C (3,1).
a. Find the length of AB
b. The gradient and equation of line AB

Given: A(1,1) B(3,4), C(3,1).
a. (AB)^2 = (31)^2 + (41)^2 = 13
AB = sqrt13.
b. m = (41) / (31) = 3/2.
Y = mx + b
1 = (3/2)*1 + b
b = 13/2 = 1/2.
Eq: Y = (3/2)x  1/2. 
Henry