Question

10. Find the value of 64x3 + 27y?, if
(i) 4x + 3y = 4 and xy = 2​

Answer 1

Answer:

given

4x +3y = 4 ..........(1)

xy = 2....... (2)

from equation 2

x = 2/y .........(3)

applying eq 3 in eq 1

then,

4 * 2/y + 3y = 4

= 8/y + 3y = 4

= (8 + 3y*y) / y =4

= 8 + 3y square = 4y

= 3y square - 4y +8 = 0

solve this and find the value y then u will get 2 value of y and put the value of y in the equation 64 * 3 + 27y

I just gave u hint and now u can try by urself.