Answer:
Givens
- The family buys 4 airline tickets online.
- The travel insurance costs $19 per ticket.
- The total cost is $752.
<h3>A.</h3>
An equation that models this problem could be

Basically, we know that the insurance costs $19 which represents an additional costs after the price per ticket, that's why we need to add them. Then, we know that the familiy bought 4 tickes, that's why we multiply by 4, and finally, the total cost must be equal to 752, according to the problem.
<h3>B.</h3>
To find the price of one ticket, we just need to solve the equation for 

Therefore, one ticket costs $169.