Question

Without graphing how can i tell if. X + 4y=28 and 2x +8y=56 is inconsistent. Dependent or neither

Answer 1

Hello : 
x+4y = 28
multiply by : 2
2x+8y =56 
same line (same graph)
the system is : Dependent
when the solution is : 
x = k  ....  k in R
y = -1/4 x +7