If 2x − 3y = 12 and x/y = 3/4, find x and y

If (0.064)(0.4)^7=(0.4)^x(0.0256)^2, find (x⁻¹−1)/(x−1).

If x^3 – y^3 = 117/8 and x – y = 3/2 then the value of x^2 + xy + y^2 will be

If 2^(2x−1) + 4^x = 2^(x−1/2) + 2^(x+1/2), then the ratio (1−x)/(1+x) is

If x + (1/y) = 1 and y + (1/z) = 1, then the value of z + (1/x) is

If x is the largest and y is the lowest among ∜6, √2 and ∛4, then (x³+y²)/(x³−y²) is