So, the question is:
The straight line l1 passes through points A(2,2) and B(6,0).
a)Find an equation for this
I found this to be: y=-1/2x+3
The straight line l2 with equation x + y = 8 cuts the y-axis at point C. The lines l1 and l2 intersect at point D.
b)Calculate the cordinates of D
I found this to be (4,4)
c) Calculate the area of traingle ACD.
I have no idea how to do this, I know point A=(2,2) C=(0,8) and D=(4,4) but that's all I know. Any help would be great.