Question

Решите уравнения а) 5(у-1,3) -4(у-5,8)=3,8

Answer 1

$\frac{3}{5} (5x - 7.5) - \frac{4}{7} (4.2 + 1 \frac{3}{4} x) = - 0.7 \\ 3x - 4.5 - 2.4 - x = - 0.7 \\ 2x = 6.9 - 0.7 \\ x = 6.2 \\ x = 3.1$

$5(y - 1.3) - 4(y - 5.8) = 3.8 \\ 5y - 6.5 - 4y + 23.2 = 3.8 \\ y = 6.5 + 3.8 - 23.2 \\ y = - 12.9$