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25 Feb 2019, 02:33
Kudos
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A
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Difficulty:
5%
(low)
Question Stats:
90% (01:12) correct
10%
(01:23)
wrong
based on 73
sessions
History
Date
Time
Result
Not Attempted Yet
What is the equation of the line that passes through the points (−4, 3) and (6, −2) ?
A. y = −1/2*x + 1
B. y = −1/2*x + 2
C. y = 1/2*x + 5
D. y = 1/2*x + 7
E. y = 1/2*x + 8
A. y = −1/2*x + 1
B. y = −1/2*x + 2
C. y = 1/2*x + 5
D. y = 1/2*x + 7
E. y = 1/2*x + 8
25 Feb 2019, 02:47
Kudos
Bookmarks
3 = -4k + n
-2 = 6k + n
You can do the system and have -10k=5, k=-1/2, then calculate n from an equation and get +1. Therefore A
Or you can consider the faster approach.
You draw the line in the coordinate plane just to see how it is going down, and therefore the k must be negative. Eliminate C, D and E as k is positive.
Now plug in the values of given points into option A -> correct, or plug in the values in B -> incorrect -> therefore A is correct.
-2 = 6k + n
You can do the system and have -10k=5, k=-1/2, then calculate n from an equation and get +1. Therefore A
Or you can consider the faster approach.
You draw the line in the coordinate plane just to see how it is going down, and therefore the k must be negative. Eliminate C, D and E as k is positive.
Now plug in the values of given points into option A -> correct, or plug in the values in B -> incorrect -> therefore A is correct.
Archit3110
Major Poster
25 Feb 2019, 04:34
Kudos
Bookmarks
Bunuel
use formula
y-y1/x-x1= y2-y1/x2-x1
solve
we get
y = −1/2*x + 1
IMO A
