Question

12x+6y=7.32
9x+13y=9.23

Answer 1

12x+6y=7.32

9x+13y=9.23

(+9)12x+6y=7.32

(-12)9x+13y=9.23

+108x+54y=65.88

-108x-156y=-110.76

se restan y queda así:

-102y=-44.88

y=-44.88/-102

y=.44

para sacar x:

12x+6y= 7.32

12x+6(.44)=7.32

12x+2.64=7.31

12x=7.32-2.64

12x=4.68

x= 4.68/12

x=.39