Question

3x+2y=12, x-2y=3. (sustitución)​

Answer 1

despejamos "x"

x-2y = 3

x= 3 + 2y

reemplazamos en :

3x+2y = 12

3(3+2y)+2y =12

9+6y+2y = 12

8y= 3

y=3/8

hallamos "x"

x=3+2y

x= 3+ 2(3/8)

x= 3 + 3/4

x= 15/4