# Milk Problem

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• Ok, so there is a half gallon and a gallon of milk, which one should I buy, if I wanted the cheaper one? The half is \$1.56 and the gallon is \$3.09. ﻿
• Do you need help ma'am?﻿
• Yes,﻿ which would be cheaper for me to buy? Half Gallon or Full Gallon?
• ﻿Oh um, I am not sure. Sir, can you do the math on which is cheaper?
• ﻿Yes, hold on a minute.
• .... so y=1.44/2x+.21? Finally, got it!
•  So, you need to subtract 3.09 from 1.65, and 4 from 2. Then you will have a fraction as -1.44/-2 and if you simplified that fraction it would be 1.44/2. Your slope is 1.44/2. Then to find your y-intercept you need to multiply 1.44/2 *4. Which is 2.88, then subtract 2.88 by 3.09. Which is .21, and that is your y-intercept.﻿ To figure out which milk you should buy, use the equation y=1.44/2x+.21
• ﻿Thank you, I will buy the half gallon!
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