An algebraic EXPRESSION will not have an equal sign so it will not be letter a or b. Since it's algebraic it will have numbers, VARIABLES, and symbols. Letter C
We are given with two equations X + y = k and <span>x - y = k. to find the solution of the </span>system<span> of linear equations, we can use elimination by adding the equations to eliminate y. hence the third equation is 2x= 2k ; x = k, hence y is equal to zero. Answer is C</span>
