The two lines y=x and x=-7 intersect on the coordinate plane. What is the value of the area of the figure formed by the intersecting lines and the x-axis? Choose the correct choice
A) 18.5 B) 21.5 C) 24.5 D) 27.5 E) 30.5
The point of intersection is (-7,-7).   The triangle has a base of length 7 and a height of 7.   area = (1/2)*base*height = (1/2)*7*7= 
<gadget id="calculator">(1/2)*7*7</gadget>
<output>49/2 = around 24.5</output>
24.5   The answer is 24.5.
<result>C</result>
The two lines y=x and x=-7 intersect on the coordinate plane. What is the value of the area of the figure formed by the intersecting lines and the x-axis?