Prove the given statement below. Please

X+y=-4 x-y=2 use elimination with adding and subtraction

Which statement is true about the local minimum of the graphed function? 27 +0,25) over the interval [-4, -2], the local minimum is 0. over the interval (-2,-1], the local minimum is 25. over the interval (-1, 4], the local minimum is 0. over the interval [4, 7), the local minimum is -7. (-34, 139,0n 760) in modo

X+ 4y − z = −14 5x + 6y + 3z = 4 −2x + 7y + 2z = −17