Question

Stabiliti prin substitutie ecuatiiei care au solutia 5;a)4+x=81/9;b)2(z-5)=0;c)5a=40;d)4n+1=46.Ajutatima varog dau coroana si 100 puncte varog mult urgent.

Answer 1

$4 + x = \frac{81}{9}$
$\frac{81}{9} le \: simplificam \: prin \: 9$
$4 + x = 9$
x=9-4
x=5
Verficarea:
4+5=9