A Web music store offers two versions of a popular song. The size of the standard version is 2.8 megabytes (MB). The size of the
high-quality version is 4.6 MB. Yesterday, the high-quality version was downloaded three times as often as the standard version. The total size downloaded for the two versions was 4482 MB. How many downloads of the standard version were there?
Let's call : x=the number of downloaded standard version y= the number of downloaded high-quality version We have : -the high-quality version was downloaded three times as often as the standard version => 3x=y -standard version is 2.8 megabytes .the high-quality version is 4.6 MB.The total size downloaded for the two versions was 4482 MB => 2.8x+4.6y=4482 Solve for x,y x=270 , y=810
<span>The dependent variable is the value that changes when one factor is changed. The independent variable is what being changed in a system. For this cae the dependent variable would be the height of the parasail while the independent variable would be the speed of the motorboat.</span>
The answer is the third option. x and y are both to the first degree so we know it makes a straight line. Next check the ordered pairs to see which set are true in the equation.
