A used book store started selling used CDs and DVDs. In the first week, the store sold a combined total of 40 used CDs and DVDs. Each CD sold for $4.00 and each DVD sold for $6.00. The sales for both CDs and DVDs totaled $180.00. Let x = CD sales and y = DVD sales

Part 1 Write a system of equations to solve for the number of CDs and DVDs sold.

Graph the system of equations (send me a picture of your graph or if you know how place in here)

Part 3 State the solution, that is, how many CD's and DVDs were sold during the first week?

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Step-by-step explanation:

step-by-step explanation:

once you graph it hit 2nd (the blue button) and graph

that takes you to a table of coordinates

on the left is x coordinates and on the right is y coordinates and an empty box

(you may have to scroll up/down in order to get ( x, 0)

1. when "a" is a root of a polynomial, (x -a) is a factor of it. for the three roots given, the factors of the desired polynomial are (x +2)(x -1/2)(x -3).

in order to make the leading coefficient be negative, we need to multiply this product by a negative number. any negative number will do, but we choose a small (magnitude) value that will eliminate the fraction: -2.

then

f(x) = -2(x +2)(x -1/2)(x -3) = -(x +2)(2x -1)(x -3)

= -(2x² +3x -2)(x -3)

= -(2x³ -3x² -11x +6)

f(x) = -2x³ +3x² +11x -6

2. a graph created by the desmos on-line graphing calculator is shown, and the zeros are highlighted.

3. as indicated in part 1, the multiplier of this equation can be anything and the zeros will remain the same. you want a negative leading coefficient, so the "anything" is restricted to any of the infinite number of numbers that will make that be the case.