Question

Dau coroana!!!!!!!!!!!!!​

Answer 1

Răspuns:

Explicație pas cu pas:

Answer 2

Răspuns:

c) x=12, y=28; d) x=117, y=26

Explicație pas cu pas:

c)

$\frac{x}{y} = \frac{3}{7} \iff 7x = 3y$

$y - x = 16 \iff y = 16 + x$

$7x = 3(16 + x) \iff 7x = 48 + 3x$

$4x = 48 \implies \bf x = 12$

$y = 16 + 12 \implies \bf y = 28$

d)

$\frac{x}{y} = \frac{9}{2} \iff 2x = 9y$

$x - 2y = 65 \iff x = 65 + 2y$

$2(65 + 2y) = 9y \iff 130 + 4y = 9y$

$5y = 130 \implies \bf y = 26$

$x = 65 + 2 \cdot 26 \implies \bf x = 117$