Identify which lines are parallel.
a) y = 4x
b) y = - 1/4x - 3
c) 12x - 3y = 6
d) 4(y + 6) = x - 3
I know the slope for a is 4 and the slope for b is - 1/4, but I need help with the others.

Question

Identify which lines are parallel.   
a)      y = 4x      
b)      y = - 1/4x - 3      
c)      12x - 3y = 6     
d)      4(y + 6) = x - 3  
I know the slope for a is 4 and the slope for b is - 1/4, but I need help with the others.

geerky42 · Answer

For others, simply isolate y to identify slope.

anonymous · Answer

a and c

geerky42 · Answer

Explain how you got this solution, @mustry

anonymous · Answer

How did you get c?

anonymous · Answer

not d is c

anonymous · Answer

condition of parallel lines
m1=m2
4=4

geerky42 · Answer

You just need to isolate y to identify slope of the equation.

anonymous · Answer

Okay. Thanks to all of you.