Hi, could anyone help me solve this question? I'd appreciate it sooo much since I can't find the correct answer.

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 .

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

What is the absolute value of the complex number -4-sqrt2i