Question

esta es la primera ecuacion 2x+y=8 esta es la segunda x-y=3

Answer 1

Método de Sustitución:

A) 2x+y= 8
B) x-y= 3
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A) 2x+y= 8
2x= 8-y
x=8-y/2
B) x-y=3
(8-y/2)-y=3
8-y/2 -y = 3 (2)

8-1y -2y= 6
-1y-2y = 6-8
-3y= -2
y= -2/-3 = 0.67

X= 8-1(0.67)/2
X= 8-0.67/2
X= 7.33/2 = 3.665

Comprobación

A) 2x+y= 8
2(3.665)+(0.67)= 8
7.33+0.67= 8
8=8


B) x-y= 3
(3.67)-(0.67)=3
3.67-0.67=3
3=3