If the square of a number is less than 1, does it follow that the number must be less than 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 .

The function models the number of accidents

X² + 4y² = 36 the major axis runs along: a) y=4x b) x-axis c) y-axis