Final answer:
The external speakers cost $340 and the TV costs $680. We found this by setting up an equation based on the information that the total cost is $1,020 and the TV is double the price of the speakers.
Step-by-step explanation:
Let's define the cost of the speakers as x dollars. According to the problem, the TV costs double that, so it would be 2x dollars. It is given that together, the TV and the external speakers cost $1,020, so we can write the following equation to represent the total cost:
x + 2x = $1,020
Combining like terms, we get 3x = $1,020. To find out the cost of one set of speakers, divide both sides by 3:
x = $1,020 / 3
x = $340
Now that we know the cost of the speakers, we can find out the cost of the TV by multiplying by 2:
2x = 2 * $340
2x = $680
Therefore, the external speakers cost $340 and the TV costs $680.