Originally Posted by

**Ifailatmaths** 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.