Mandy used the graph to write the equation of the line it represents. She took these steps. 1.   y−intercept = (0, 2)

2.   Slope =
rise
run
=
− 2
4
= −
1
2

3. Substituting values into y = mx + b

The equation of the line is:

Step-by-step explanation:

If the y-intercept is at (0, 2) that is y=2 when x=0, and the slope (m)  is    , then one can write the equation in slope y-intercept form by appropriately substituting the slope first and the the condition for the y-intercept (when x=0, y=2) to have all parameters for the equation of the line:

the interior has a radius of 3 so 3*3*3.14=28.26

the whole thing has a radius of 5 so 5*5*3.14=78.5

then 78.5-28.26= give you a total of 50.24 as area of the outer circle