Answer:
y<=-3x-3
Step-by-step explanation:
m=y2-y1/x2-x1
m=-6-3/1-2
m=-3
y-y1=m(x-x1)
y-3=-3(x-(-2))
y-3=-3x-6
y=-3x-6+3
y=-3x-3
we change the equal sign to a "less than or equal to" sign to get the final answer of y <= -3x-3
Triangles with height 
and base 
, with 
have area 
.
Such cross sections with the base of the triangle in the disk 
(a disk with radius 5) have base with length
i.e. the vertical (in the 
plane) distance between the top and bottom curves describing the circle 
.
So when 
, the cross section at that point has base
so that the area of the cross section would be 6^2/2 = 18.
In case it's relevant, the entire solid would have volume given by the integral
If you want to know how much is 3x6 the answer is 18
