I. 63x²+ 148x + 77 = 0

II. 21y²+ 89y + 88 = 0

I. 99x² + 161 x + 26 = 0

II. 26 y² + 161 y + 99 = 0

I. x ² + 5 x  + 6 = 0                 

II. y²+ 7 y  + 12= 0

I. 6x²- 41x+13=0

II. 2y²- 19y+42=0

I. 2x² - 12x + 16 = 0    

II. 4y² - 8y  - 12 = 0    

I. x + 1 = ³√ 9261

II. y + 1 = √ 324

I. 104x² + 9x - 35 = 0

II. 72y² - 85y + 25 = 0

I.  2^(x+2)+ 2^(-x)=5

II.  (1/(y+1)+ 1/(y+5))=(1/(y+2)+  1/(y+4))

I. 8x – 3y = 85

II. 4x – 5y = 67

I. x² - 208 = 233

II. y² + 47 - 371 = 0