The answer is B. Plug in the x values to check the y values.
The answer is Pythagorean
The Pythagorean theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle. It states that the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides.
All except combine like terms. Since you only have 1 variable.
Hope this helps.
r3t40