Answer:
9 lb
Step-by-step explanation:
Set the equation. First, write the expression out:
An online retailer charges $6.99 plus $0.55 per pound.
Note that $6.99 is a one-time charge (the constant), and so it is added on.
$0.55 is connected to the variable of pounds, for you do not know how much pounds there are in all.
Set the equation based on information provided:
Total Cost = Constant + (Cost per pound x Amount of pounds).
Note that:
Total Cost = $11.94
Constant = $6.99
Cost per pound = $0.55
Amount of pounds = x
Plug in the corresponding numbers & variables to the corresponding terms:
11.94 = 6.99 + (0.55x)
Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. First subtract, then divide:
11.94 = 6.99 + 0.55x
11.94 (-6.99) = 6.99 (-6.99) + 0.55x
0.55x = 11.94 - 6.99
0.55x = 4.95
Divide 0.55 from both sides to fully isolate the x:
(0.55x)/0.55 = (4.95)/0.55
x = 4.95/0.55
x = 9
9 lb is the amount of pounds of the DVD player.
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