Răspuns :
4m+5p=190 / •3
3m+2p=90 / •(-4)
12m+15p = 570
-12m-8p=-360
_____________
/ 7p=210
p=210:7
p=30
4m+5•30=190
4m+150=190
4m=190-150
4m=40
m=40:4
m=10
Am rezolvat prin sistem .
4m+5p=190 3m+2p=90; daca scadem osa avem 1m+3p=100;1m=100-3p inlocuim p=30 m=100-90; m=10