<span>(2+a)/2=-1 </span> <span>2+a=-2 </span> <span>a=-4 </span> <span>(4+b)/2=1 </span> <span>4+b=2 </span> <span>b=-2 </span> <span>Then Z is (-4,-2) </span> I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!