Răspuns :
[tex]a + b = 63 \\ a = 8b \\ 8b + b = 63 \\ 9b = 63 \\ b = 63 \div 9 \\ b = 7 \\ \\ a = 8b \\ b = 7 \\ a = 7 \times 8 \\ a = 56[/tex]
[tex]a + b = 63 \\ a = 8b \\ 8b + b = 63 \\ 9b = 63 \\ b = 63 \div 9 \\ b = 7 \\ \\ a = 8b \\ b = 7 \\ a = 7 \times 8 \\ a = 56[/tex]