make Signal like vectorT{ax1[n]+bx2[n]}=T{ax1[n]}+T{bx2[n]}=ay1[n]+by2[n]T\{ax_1[n] + bx_2[n]\} = T\{ax_1[n] \} +T\{bx_2[n]\} = ay_1[n] + by_2[n]T{ax1[n]+bx2[n]}=T{ax1[n]}+T{bx2[n]}=ay1[n]+by2[n]First equality is Superposition Second equality is Homogeneous function