Question

x+y=30
x-y=8
quero co todos los dato

Answer 1

hacemos reduccion:

x+y=30
x-y=8

$\frac{x+y=30}{x-y=8} \\ \\ 2x=38 \\ \\ x= \frac{38}{2} \\ \\ x=19 \\ \\ si \ x=19 \\ \\ \\ x+y=30 \\ 19+y=30 \\ y=30-19 \\ \\ y=11 \\ \\ solucion: \\ x=19 \ \ \ y=11$