The area of triangle formed by the lines y=5-x , y=1 and , x=0 is?

Question

16, 8, 4, 2

Answer 1

Sketch the lines on a graph and it will be obvious how to solve the triangle.  Then use A = 1/2 * b * h

Answer 2

Answer is 8.

These lines form a triangle with two equal cathetus of 4 units each and one 90-degrees angle. In other words, this is half of a square (cut by its diagonal) with a length side of 4. So 4x4/2=8.