Need help with writting an linear equation

Step-by-step explanation:

Let y represent the cost of buying the ticket.

Let x represent the number of days

in which the ticket was purchased before the departure day.

The relationship is inversely proportional because as x is reducing, y is increasing. The slope of the equation would be negative

Thus,

Slope = (239 - 189)/(0 - 20 = - 50/20 = - 2.5

If we apply the slope intercept form which is expressed as y = mx + c to model the equation, the y intercept, c would be 239 since it is the y value at which x = 0

The linear function used to model the situation becomes

y = - 2.5x + 239

The cost of the ticket when Marcus buys it for 3 days before his departure would be

y = - 2.5 × 3 + 239

y = - 7.5 + 239

y = $231.5

answ5

step-by-step explanation:

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