A) y+2 = 1/3x
B) -2x+6 = Y
C) 9x-3y = 27
D) 3x+y = 0
The slope of line l is 1/3. Which equation produces a line that is perpendicular to line l .?
2017-04-01 6:26 am
回答 (4)
2017-04-01 6:38 am
✔ 最佳答案
The equation would need to have slope of -3y = -3x +b
or
3x + y = b in some form.
Ans D
2017-04-01 6:34 am
D. Y=-3x
Perpendicular lines have slopes that are opposite reciprocals of each other, and when multiplied, their product is -1. -3 is the opposite reciprocal of 1/3
Perpendicular lines have slopes that are opposite reciprocals of each other, and when multiplied, their product is -1. -3 is the opposite reciprocal of 1/3
2017-04-01 7:57 am
D). You need negative reciprocal slopes to produce perpendicular lines. Since slope of first line is 1/3, the other slope must be -3. 3x + y = 0 ---> y = -3x. The coefficient of x is the slope; there's your proof.
2017-04-01 7:47 am
obviously D)
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