Question

5 creioane si 3 pixuri costa 19 lei. 3 creioane si 6 pixuri costa 24 lei .Cat costa un creion?           A se rezolva printr-o ecuatie sau o inecuatie.

Answer 1

[tex]5c+3p=19~lei \\ 3c+6p=24~lei \\ -------- \\ 1c=? \\ -------- \\ Luam~din~nou~relatiile: \\ 5c+3p=19~lei|*2~~=>10c+6p=38~lei \\ 3c+6p=24~lei~~~~~~~=>3c+6p=24~lei \\ Scadem~cele~doua~relatii: \\ 7c=14~lei \\ \boxed{c=2~lei} [/tex]