Which set of ordered pairs is a function (1, -1), (2,-2), (3, -3) (1, 1), (2, 2), (2, -2)
(1, 1), (2, 2), (3, 3)
(1, 1), (2, 1), (3, 1)
(0, 1), (0, 2), (0, 3)

Paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each? 1. define a variable for the situation. 2. write an inequality that represents her profit. note: revenue is money coming in. cost is money going out. profit is the difference between the revenue and the cost. in other words: revenue - costs profit 3.using words, describe how many windows she must sell to have a profit of at least $48,000.