Выберите линейные функции:

• \(\displaystyle y=-\frac{7}{8}\)
• \(\displaystyle y=-\frac{13}{25}x^{\,10}\)
• \(\displaystyle y=20x^{\, 1}-1\)
• \(\displaystyle y=0\)
• \(\displaystyle y=1-\frac{7}{x}\)