Question

Numerele a si b sunt direct proportionale cu 3 si 5.Daca 3a+2b=38 ,atunci determinati numerele

Answer 1

{a;b} d.p {3;5}
a supra 3 =K =>a=3k
b supra 5=K=>b=5k

3x3k+2x5k=38
9k+10k=38
19k=38
k=38:19
k=2

a=3x2
a=6

b=5x2
b=10

Answer 2

{a,b}d.p.{3,5}
a=3k
b=5k
3x3k+2x5k=38
19k=38
k=2
a=6
b=15