Don't mind my answers, I really don't understand this.

Dependent variable: y

Independent variable: 2x

Step-by-step explanation:

The dependent variable is the variable that relies on the independent variable for its value. In this situation, you can't have y without x.

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.