A sum of scalar multiples of two or more vectors (such as c₁u + c₂v + c₃w, where c_i are scalars) is called a linear combination of the vectors. Let i = (1, 0), j = (0, 1), u = (1, 1), and v = (-1, 1).

Express (4, -8) as a linear combination of i and j (that is, find scalars c₁ and c₂ such that (4, -8) = c₁i + c₂ j).