Hello,

I've got the following question:

The answer says it's 4 but I have no clue as to why?The area of the triangle bounded by the three lines x = 0, y = 0, and x + y = a has an area of 8. What is a?

Is it because a rectangle is double the area of the triangle in question which is 16? And the length and width would both 4 on this right angled triangle?

It sounds overly complicated so I'm not sure if there's a simpler explanation?