Question

ex a b si c dau coroana urgent va rog sa ma ajutați ​

Answer 1

a)

$x = 11 - 2y$

$8x = - 2 + 2y = > \times \frac{ - 2 + 2y}{8} = \frac{ - 1 + y}{4}$

$11 - 2y = \frac{ - 1 + y}{4} = > 44 - 8y = - 1 + y$

$9y = 45 = > y = 5$

$x = 11 - 10 = 1$

b)

$x = - 10 - 3y$

$x = 5 + 2y$

$- 3 - 3y = 5 + 2y$

$5y = - 8$

$y = - \frac{8}{5} = - 1.6$

$x = 1.8$

c)

$x = \frac{7.5 + 3y}{2}$

$x = \frac{9 + y}{5}$

$\frac{9 + y}{5} = \frac{7.5 + 3y}{2}$

$18 + 2y = 37.5 + 15y$

$- 19.5 = 13y$

$y = 1.5$

$x = 5.25$

COROANA?

;))