Question

5x/2-y=9 x-3y/4=15 ayudaaaaaa xf doy coronaaaaa ​

Answer 1

Explicación paso a paso:

$\frac{5x}{2} - y = 9 \\ \frac{5x}{2} = 9 + y \\ 5x = 2(9 + y) \\ x = \frac{18 + 2y}{5}$

$x - \frac{3y}{4} = 15 \\ x = 15 + \frac{3y}{4}$

$\frac{18 + 2y}{5} = 15 + \frac{3y}{4} \\ 18 + 2y = 5(15 + \frac{3y}{4} ) \\ 18 + 2y = 75 + \frac{15y}{4} \\ 4(18 + 2y - 75) = 15y \\ 72 + 8y - 300 = 15y \\ - 7y = 228 \\ y = \frac{228}{ - 7}$

$\frac{5x}{2} + \frac{228}{7} = 9 \\ \frac{35x + 456}{14} = 9 \\ 35x + 456 = 9(14) \\ 35x = 126 - 456 \\ x = \frac{ - 330}{35} \\ x = - \frac{66}{7}$