The sale price of ground beef at a local grocery store is $1.49 for the first pound and $1.09 for each additional pound. Which function rule shows how the cost of ground beef, depends on the number of pounds, x
1. y = 1.49x + 1.09
2. y= 1,09 (x - 1 ) + 1.49
3. y = ( 1.09 +1.49)x
4.y= 1.09x + 1.49
4. y = 1.09x + 1.49
explain why
The cost of ground beef depends on the number of pounds purchased. The cost for the first pound is $1.49. For each additional pound, the cost is $1.09. This means that the additional pounds are charged at a different rate than the first pound, which is a fixed amount.
The function rule y = 1.09x + 1.49 incorporates this by adding $1.09 for each additional pound beyond the first pound (which is already included in the $1.49 base cost). To find the total cost, we multiply the number of additional pounds (x-1) by the additional cost of $1.09 and add the base cost of $1.49. Therefore, this function rule accurately models the cost of ground beef as a function of the number of pounds purchased.
The correct function rule that shows how the cost of ground beef depends on the number of pounds, x, is:
4. y = 1.09x + 1.49