Question

Se x + y = 10 e x - y = 7 , dê o valor numérico de 2x+2y: *

Answer 1

olá !!!

$x + y = 10\\x - y = 7\\\\x=10\\x=7\\soma\\2x=17\\x=8,5\\\\x + y = 10\\8,5+y=10\\y=10-8,5\\y=1,5\\\\\\x - y = 7\\8,5-y=7\\-y=7-8,5\\-y=-1,5\\y=1,5$

espero ter ajudado

att: jovem lendário