
I currently need help on math....
Line 1 and Line 2 are parallel if and only if m1=m2(or the slopes)
The "only if" part is equivalent to: If m1 does not equal m2, then Line 1 and Line 2 are not parallel. Show that if m1 does not equal m2, then the equations Line 1: y=m1x+b1 and Line 2: y=m2x+b2 have a common solution.



