x=2a-1,y=2a-2,2=3-4a ,x^3+y^3+2^3=?

Question

x=2a-1,y=2a-2,2=3-4a ,x^3+y^3+2^3=?

Answer 1

2 = 3 - 4a => a = 1/4

x= 2(1/4) - 1 = -1/2

y = 2(1/4) - 2 = -3/2

$x^3=-1/8$

$y^3=-27/8$

$x^3+y^3+8=$ $\frac{(-28+64)}{8}$ = $\frac{36}{8}$ = 4 1/2