You let y represent the total cost of publishing a book (in dollars). let x represent the number of copies of the book printed. suppose that x and y are related by the equation = y + 15 x 1200 . note that a change can be an increase or a decrease. for an increase, use a positive number. for a decrease, use a negative number.

change in the total cost for each book printed = $15

cost to get started (before books are bought) = $1200

Step-by-step explanation:

IF the eqn is y = 15x +1200

where y  represent the total cost of publishing a book (in dollars) and

x  represent the number of copies of the book printed

then cost to get started (before books are bought) can be found by substitute x=0 into the eqn

y = 1200 + 15*0 = $1200

change in the total cost for each book printed will be the difference in total cost at x=0 and x=1

when x=0, y=1200

when x=1, y=1200+15*1=1215

so the change in total cost=$15

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step-by-step explanation: