Which function is used to remove unwanted characters

I. 2x² + 3x - 9 = 0

II. 3y² - y - 10 = 0

I. 3x² - 14x + 15 = 0

II. 15y² - 34 y + 15 = 0

I. 40x² + 81x + 35 = 0

II. 63y² + 103y + 42 = 0

I. p² - 10p +21 = 0

II. q² + q -12 = 0

I. 5x + y = 37

II. 4y+ x = 15

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

Equation 1: x² - 34x + 288 = 0

Equation 2: y² - 29y + 210 = 0

Equation 1: x² - 90x + 2025 = 0

Equation 2: y² - 88y + 1936 = 0

I. x² + 24x + 143 = 0

II. y² + 12y + 35 = 0

I. x² - 33x + 270 = 0

II. y² - 41y + 414 = 0

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

Equation 1: x² - 21x + 110 = 0

Equation 2: y² - 23y + 132 = 0