A gas station sells a coffee mug filled with coffee for $3. For each refill, using the same mug, the gas station charges $1.25 f
or the coffee. If y represents the total cost and x represents the total number of filled coffee mugs purchased, which function rule describes this pattern?
Since the price of the coffee itself is $1.25, the gradient of the function will be 1.25 and will give a straight line. However, since the first cup of coffee costs $3, when extrapolated to x = 0, the price is 3 - 1.25 = $1.75 which indicates the cost of using the cup. Therefore this is the y-intercept. This can be expressed as a linear function of y = mx + c where y is the price, m is the gradient, x is the number of times the cup has been filled with coffee, and c is the price of using the cup, giving: y = 1.25x + 1.75
C would be the correct answer. You caanot multiply just one part of an equation, you must multiply the whole thing. All of the other steps follow this rule, so C is an incorrect step, and is therefore the correct choice.
