👤

daca 7a+8b=22si a+2b=4 afla a

Răspuns :

7a+8b=22
a+2b=4

4a+8b=4 x 4=16
3a=22-16=6
a=2
b=1
7a+8b=22
a+2b=4

4a+8b=4×4=16→
3a=22-16=6
a=2
b=1