Their slopes must be the same, but with different y-intercepts.
Here is an example: 2x + 1 and 2x + 4 are parallel lines.
        
             
        
        
        
hey, u didn’t rlly attach anything :/
 
        
             
        
        
        
No he isn't..
. 7×10=7
for each time it's multiplied by ten, the decimal point goes back one.