Abag of eight hot dog buns sells for $2.60 a second bag of 12 hot dog buns sell for $4.20 which bag of hot dog buns is the better deal

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

Abus travels 36 miles in 45 minutes. enter the number of miles the bus travels in 60 minutes at this rate.