SOLUTION: Are these two lines perpendicular? Line 1: y=x+3 Line 2: x-y=13

Question 115632: Are these two lines perpendicular?
Line 1: y=x+3
Line 2: x-y=13
Found 2 solutions by stanbon, jim_thompson5910:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Are these two lines perpendicular?
Line 1: y=x+3
Line 2: x-y=13
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L1: y = x+3
L2: y = x-13
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Both have a slope of m = 1 so the lines a parallel.
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Cheers,
Stan H.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Let's solve for y in the second equation

Start with the given equation

Subtract x from both sides

Multiply both sides by -1 to isolate y. This will change the sign of all of the terms on the right

Now since the slope of the first line is and the slope of the second line is also , these two lines are parallel. So they cannot be perpendicular.
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