Question 427061
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Hi
Note: the idea solving using substitution is for that to result
in an equation with ONE unknown.

2x+4y=12    OR  x = 6-2y    |solving for x
4x+16y=8   |Substituting that into the 2nd EQ
4(6-2y)+16y = 8    |now we have an EQ with ONE unknown
solving for y
 24 - 8y + 16y = 8
       8y = -16
        y = -2    and x = 10   (6- 2*-2)

CHECKING our Answer***
 4x+16y=8 
 40 -32=8