Question

alguém pode me ajudar? preciso das contas também​

Answer 1

$a) x+y=11\\x-y=3\\2x=14\\x=7\\x+y=11\\7+y=11\\y=11-7\\y=4\\\\b)x-y=1\\x+y=9\\2x=10\\x=5\\x+y=9\\5+y=9\\y=9-5\\y=4\\\\c) x-y=16\\x+y=74\\2x=90\\x=45\\x-y=16\\45-y=16\\-y=-29 (-1)\\y=29\\\\\\d)\2x-y=20\\2x+y=48\\4x=68\\x=17\\2x-y=20\\34-y=20\\-y=-14 (-1)\\y=14\\\\e) 2x-3y=-16\\5x+3y=2\\7x=-14\\x=-2\\2x-3y=-16\\-4-3y=-16\\-3y=-12\\y=4$