Question

10x+18y=-11 ; 16x-9y=-5 metodo de reduccion

Answer 1

Primero enumeramos las ecuaciones
Ec1 10x+18y=-11
Ec2. 16x-9y= -5
Multiplicamos por 2 a Ec2
16x-9y= -5 => 32x-18y= -10

10x+18y=-11
32x-18y= -10
42x +0= -21
42x= -21
x= -21/42
x= -1/2
Reemplazo en Ec1
10(-1/2)+18y= -11
-10/2 +18y= -11
18y = -11 +5
y= -6/18
y= - 1/3
Sol. X= -1/2, y= -1/3