a recipe calls for 2/5 cups of sugar for every 3/4 cup of flour. How much sugar is needed for 1 cup of flour?

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 .

Convert 2000 swiss francs to dutch guilders

Def rotates 90 clockwise about point a to create d’ e’ f’. therefore, which equation must be true ?