An equation that shows the dependence of y and x is y = 20 - 3x.
The domain of the function will be [1, 6].
Given the following
The total amount had by Abi = 20 cents
If she bought x pencils for 3 cents each, the total spent on pencils will be 3x cents.
Amount left = Total amount - 3x
Amount left = 20 - 3x
If y equals to the number of cents left, hence;
y = 20 -3x
Hence an equation that shows the dependence of y and x is y = 20 - 3x.
Since the value of y cannot be negative, the domain of the function will be [1, 6]. She can only buy 6 pencils with 20 cents
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