Find the value of x or y so that the line through the points has the given slope.
(x,6) and (-5,8); slope: -1/2

X= -1 
(-1,6) and (-5,8) has a slope of -1/2

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