Question

Numerele a si b sunt direct proportionale cu numerele 7 si 3
Daca a-b=8 aflati cele 2numere
va rog!

Answer 1

a-b=8⇒a=8+b;

k=a/7=b/3

a=7k

b=3k

7k=8+3k

7k-3k=8

4k=8

k=8/4

k=2

a=7*2=14;

b=3*2=6.

Bafta!

Answer 2

{a,b} d.p {7,3}
a supra 7 = k =7k
b supra 3 = k = 3k

a-b=8
7k-3k=8
4k=8
k=8÷4
k=2

a=7×2=14

b=3×2=6

verificare: 14-6=8