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Abi has 20 cents. She bought x pencils for 3 cents each. If y is equal to the number of cents left. write an equation that shows the dependence of y on x. What is the domain of the function

Respuesta :

onyebuchinnaji

The equation for the number of cents left is y = 20 - 3x

The domain of the function is  x < 6

The given parameters;

  • number of pencils bought = x
  • cost of each pencil = 3
  • cost of all the pencils = 3x
  • number of cents left = y

The equation for the number of cents left is as follows;

y = 20 - 3x

The domain of the function is calculated as;

at x = 1

y = 20 - 3 = 17

at x = 6

y = 20 - 18 = 2

at x = 7

y = 20 - 21 = -1

Thus, the domain of the function is  x < 6

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