Question

Sa se afle numerele a,b,c daca sunt direct proportionale cu nr. 2,6,-4 si a+2c=42
Dau coroana

Answer 1

a/2=b/6=c/-4 =k
a=2k
b=6k
c=-4k
a+2c=2k-8k=42
-6k=42
k= -7
a= -14
b= -42
c=28