Question

Aflati doua numere x si y , stiind ca : a ) x-y=10 si x/y = 5/3 b) 3x-y=12 si x\y = 3/5

Answer 1

a ) x-y=10 si x/y = 5/3
3x=5y
x=5y/3
5y/3-y=10
5y-3y=30
2y=30
y=15
x=5*15/3=25

b) 3x-y=12 si x\y = 3/5
5x=3y
x=3y/5
3(3y/5)-y=12
9y-5y=60
4y=60
y=15
x=3*15/5=9