Question

1. Tatal si fiul parcurg impreuna o distanta, tatal facand pasi de 72 cm, iar fiul facand pasi de 50 cm . Aflati lungimea minima a distantei parcurse de cei doi.

2. Rezolvati in R x R sistemul: 2x + 5y = 20
x-y=3

Answer 1

1)72+50=122
122:2=61cm

2)2a+5b=20
 2a+5b=20
a-b=3·(-2)
-2a+2b=-6
7b=14:7
 b=2
2a+5b=20
a-b=3·5
5a-5b=15                
7a =35:7   
a=5