which of the linear systems has infinitely many solutions?

Question

A.  y=3x+4  y=3x+7

 

B.  y=3x-5  y=3x+5

 

C. y=3x+4  y=3x-7 

 

D. y=3x-1  y=-3x+1

 

Please show steps

Answer 1

All the lines are parallel. They only differ in their intercept b, hence there is no solution for those systems of equations.

Answer 2

Are you sure these are the equations. None of these equations has a solution. They are all parallel.