Question

Halla el valor de “X + Y”
5x + y = 15
-y – 7x = -19

Answer 1

Respuesta:

5x + y = 15

-y – 7x = -19

Explicación paso a paso:

$5x\:+\:y\:=\:15\\5x+y-y=15-y\\5x=15-y\\\frac{5x}{5}=\frac{15}{5}-\frac{y}{5}\\x=\frac{15-y}{5}$

$-y\:-\:7x\:=\:-19\\-y-7x+y=-19+y\\\frac{-7x}{-7}=-\frac{19}{-7}+\frac{y}{-7}\\x=-\frac{-19+y}{7}$