Line ab contains points a (1, 2) and b (−2, 6). the slope of line ab a. zero b. undefined c. positive d. negative

Slope=6-2/-2-1=4/-3=-4/3 So the answer is D a negative number.

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct