Question

if x minus 2 Y is equal to 11 and X Y is equal to 8 find the value of x cube and 8y cube

Answer 1

x - 2y = 11
xy = 8
 x = 8/y       ----------(i)

8/y - 2y = 11
 8 - 2y sq.= 11y
2y sq. - 8 +11 = 0
 solve the equation and find the value of y
  put the value of y in eq. ----(i)
  and find the vlaue of x