Marge saved 350$ toward the cost of here vacation. the vacation will cost 1750$ what percent of the cost does margehave saved

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 .

Asap! i'm not good math and i'm lost.

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?