(a) What is the area of the triangle determined by the lines
y =−1/2x + 9, y =10x, and the y-axis?
Thus we already know that
Area of triangle= 1/2*b*h
Base=9
Now to find the height, we need the coordinates of the intersection so:
−1/2x+9=10x
x=6/7 <=height
y=60/7
So using the formula
Area=1/2*b*h= 1/2*9*6/7
=3.8571428
