The points q(7, 0, 0), p(0, −5, 0), and r(0, 0, 4) form a triangle. find the lengths of the sides of the triangle.

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 .

Anyone know? will mark brainliest if correct!

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