Question

solve any four questions ​

Answer 1

5)

$2x + 5y = 10 \\ 1) \: 2x + 5y = 10 \\ = > 2x = 10 - 5y \\ = > \: x = \frac{10 - 5y}{2} \\ 2)2x + 5y = 10 \\ = > 5y = 10 - 2x \\ = > \: y = \frac{10 - 2x}{5}$

7) $6:5 = x:25 \\ \frac{6}{5} = \frac{x}{25} \\ = > \: 5x = 150 \\ = > \: x = \frac{150}{5} \\ = > \: x = 30 \\ = > \: 6:5 = 30:25$