Abag contains x blue chips and y red chips. if the probability of selecting a red chip at random is 3/7, then x/y.

What is the slope of a line that is perpendicular to y = 3x + 1

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 .

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?