PLEASE HELP ME!!
A pizza parlor offers pizzas with diameters of 6 in., 8 in., and 10 in. Find the area of each size pizza. Use 3.14 for π. Round each area to the nearest tenth, and each cost to three decimal places. If the pizzas cost $9, $12, and $18 respectively, which is the better buy?
The area of the 6-in pizza is about in2, and costs $ per in2.
The area of the 8-in pizza is about in2, and costs $ per in2.
The area of the 10-in pizza is about in2, and costs $ per in2.
The better buy is the (drop list) pizza.
Options of drop list: 6 in., 10 in., 8 in.

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is