Medium· Solving linear equations using matrices· +4 / −1If the system of linear equations 2x+y−z=7x−3y+2z=1x+4y+δz=k\begin{aligned}2x+y-z&=7\\ x-3y+2z&=1\\ x+4y+\delta z&=k\end{aligned}2x+y−zx−3y+2zx+4y+δz=7=1=k where δ,k∈R\delta,k\in\mathbb Rδ,k∈R, has infinitely many solutions, then δ+k\delta+kδ+k is equal to :A−3-3−3B333C666D999Check answerJust show me the answer
