(320 + 342 + 530 + 915) ÷ (20 + 22 – x + 18) = 43,

I. x² - 4x – 21 = 0

II. y² + 12y + 20 = 0

I. 6x² + 19x + 10 = 0

II. y² + 10y + 25 = 0

I. 5x² - 28x + 39 = 0

II. 2y² - 13y + 20 = 0

I. 4 x ² - 4 x + 1 = 0

II. 4 y ² + 4 y + 1 = 0

I. x³ = 1728

II. y² – 15y + 56 = 0

I. 63x² + 37 x – 40 = 0

II. 15 y² + 29 y + 12 = 0

I:  x² - 33x + 242 = 0

II:  y² - 4y - 77 = 0

I. 40 x² - 93 x + 54 = 0

II. 30 y² - 61 y + 30 = 0

I. 20x² - 93x + 108 = 0

II.72y² - 47y - 144 = 0

Solve the quadratic equations and determine the relation between x and y:

Equation 1: x² - 40x + 300 = 0

Equation 2: y² - 30y + 216 = 0