Part a: the graph of which equation below is a horizontal line?
1) x + y =3
2) y = 3
3) x = 3
4) x/y = 3

part b: explain in 3-4 sentences why your equation in part a is a horizontal line. your answer should include at least 4 of the following words: x-coordinate, y-coordinate, ordered pair, slope, y-intercept, slope-intercept form

Someone answer asap for ! a discount store’s prices are 25% lower than department store prices. the function c(x) = 0.75x can be used to determine the cost c, in dollars, of an item, where x is the department store price, in dollars. if the item has not sold in one month, the discount store takes an additional 20% off the discounted price and an additional $5 off the total purchase. the function d(y) = 0.80y - 5 can be used to find d, the cost, in dollars, of an item that has not been sold for a month, where y is the discount store price, in dollars. create a function d(c(x)) that represents the final price of an item when a costumer buys an item that has been in the discount store for a month. d(c(x)) =