How many values of x and y satisfy the equation 2x + 4y = 8 & 3x + 6y = 10.

I. x=  √(20+ √(20+ √(20+ √(20…………….∞)) ) ) 

II. y= √(5√(5√(5√(5……….∞)) ) ) 

I. 5x + y = 37

II. 4y+ x = 15

I. 8x² - 78x + 169 = 0

II. 20y² - 117y + 169 = 0

I. 20x² - 93x + 108 = 0

II.72y² - 47y - 144 = 0

If α, β are the roots of the equation x² – px + q = 0, then the value of α²+β²+2αβ is 

I. 2y² - 15y + 18 = 0

II. 2x² + 9x - 18 = 0

I. 2x² – 10x – 48 = 0

II. y² – 16y – 297 = 0

I.√(3x-17)+ x=15

II.  y+  135/y=24 

I. 20y² - 13y + 2 = 0

II. 6x² - 25x + 14 = 0