(i) Given that 15x² - 18xy + 3y² = a(bx-y)² - c(x + y)² for all values of x and y, determine the values of a, b and c.

(ii) Find all pairs of values (x, y) that satisfy the simultaneous equations

(1) 15x² - 18xy + 3y² = 0

(2) 10x² - 16xy + y²  + 5 = 0