Question

Help, quick, pls What is a displacement reaction?

Answer 1

A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule. For instance, when iron is added to a copper sulphate solution, it displaces the copper metal. A + B-C → A-C + B.

Answer 2

$\begin{aligned} -5x+4y &= 3\\\\ x&=2y-15 \end{aligned}$