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Question 120668: Determine which two equations represent perpendicular lines.
y=4/9x-5
y =5x-4/9
y= -1/5x +4/9
Y=1/5x-4/9
Answer by rapaljer(4671)   (Show Source):
You can put this solution on YOUR website! With perpendicular lines, the slope of one is the negative reciprocal of the other, where the slope of the line in slope intercept form is the coefficient of x.
For the first line, the slope is 4/9. A perpendicular line will have slope -9/4.
For the second line, the slope is 5. The negative reciprocal is -1/5, which is the third line.
Therefore, the second and third lines are perpendicular.
R^2 Retired
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