Answer:
The linear equations have the same slope but different y-intercepts.
Step-by-step explanation:
A linear equation has the general form

where
is the slope and
is the y-intercept.
In the case of the first line 

and 
for the second line 

and 
Thus, the lines have the same slope but a different y-intercept.
This is why they are parallel, because they increase at the same rate always (hence the same slope) and the cross the y-axis at different point (hence the different y-intecept)