Question 125168
Solve the following system by substitution 
8x-4y=16
y=2x-4 
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Simplify the 1st equation:
2x-y = 4
Substitute to get:
2x-(2x-4)=4
2x-2x+4=4
4=4
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This means the two original equations are really the same;
one is a multiple of the other.
The system is described as "dependent".
The solution set is the set of all points on the line y = 2x-4
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Cheers,
Stan H.