Step-by-step explanation:
We can rearrange line M so it is in y = mx + b form.
2y - 10x + 3 = 0 -> 2y = 10x - 3 -> y = 5x -3/2. Since line L and line M have the same slope (which is the m value, 5), they are parallel.
I hope this helps! :)
SSS - the side they're sharing is also congruent so if you just add in the other congruent sides you get SSS
Y = 3x + b
6 = 3(4) + b
6 = 12 + b, b = -6
Equation: y = 3x - 6