SOLUTION: Identify the lines that are perpendicular: LINES: http://my.thinkwell.com/questionbank/92001-93000/92176/img/243357.gif

Question 917810: Identify the lines that are perpendicular:
LINES:
http://my.thinkwell.com/questionbank/92001-93000/92176/img/243357.gif
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

you got
line 1.
line 2.
line 3.
line 4.
by definition, perpendicular lines have slopes negative reciprocal to each other

line 1. ....slope is zero, line is parallel to x-axis
line 2. ... slope is
line 3. ....slope is zero, line is parallel to x-axis
line 4. ........slope is
check if ; if yes, then lines are perpendicular

...true, so lines 2 and 4 are perpendicular

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