Question

a si b sunt direct proportionale cu 2 si 5. Aflati 5a-b,stiind ca 3a+b=44

Answer 1

a, b direct proportionale cu 2, 5 => a/2=b/5=k

===> a=2k si b = 5k

3a+b=44===> 3*2k+5k=44====>6k+5k=44===> 11k=44=> k=4

a=2k=2*4=8

b=5k=5*4=20

5a-b=5*8-20=40-20=20