If 2 lines that are L1 (−2, −1),(1, 5) and L2 (1, 3),(5, −5) are the lines parallel?

I never took Algebra 1 due to going to a higher level high school and I never learned some of the steps and I'm confused please help.
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1 Answer

line 1 go thru points: (-2,-1) & (1,5)

line 2 go thru points: (1,3) & (5,-5)

line1...deltax=3, deltay=6, slope=deltay/deltax=6/3=2

line 2...deltax=4, deltay=-8, slope=-8/4=-2

NOT parallel...differ slope
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