Question

Реши систему уравнений {10k=15 {k+m=9
{k=?
{m=?

Answer 1

$10k = 15 \\ k + m = 9 \\ k = 9 - m \\ 10 \times (9 - m) = 15 \\ 90 - 10m = 15 \\ - 10m = - 75 \\ m = \frac{75}{10} = \frac{15}{2} \\ k + \frac{15}{2} = 9 \\ 2k + 15 = 18 \\ 2k = 3 \\ k = \frac{3}{2}$