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28 Sep 2019, 12:03
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Difficulty:
25%
(medium)
Question Stats:
74% (01:39) correct
26%
(01:55)
wrong
based on 282
sessions
History
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Not Attempted Yet
The point R in the xy-plane with coordinates (–8, 3) is reflected over the line ll, giving the point R’ with coordinates (–3, 8). What is the equation of the line ll?
(A) x = 0
(B) y = 0
(C) y = x
(D) y = – x
(E) y = –3
(A) x = 0
(B) y = 0
(C) y = x
(D) y = – x
(E) y = –3
29 Sep 2019, 22:07
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shridhar786
The point R in the xy-plane with coordinates (–8, 3) is reflected over the line ll, giving the point R’ with coordinates (–3, 8). What is the equation of the line ll?
(A) x = 0
(B) y = 0
(C) y = x
(D) y = – x
(E) y = –3
(A) x = 0
(B) y = 0
(C) y = x
(D) y = – x
(E) y = –3
Since it is about reflection, mid point of line joining both the given points will lie on the line II.
Mid point is (-8-3)/2, (3+8)/2=(-11/2, 11/2)
For positive value of Y, X is negative( Magnitude is also same for both the values)
Hence Y= -X
D:)
General Discussion
29 Sep 2019, 22:22
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The reflection of (x, y) across line x=0 is (-x, y)
The reflection of (x, y) across line y=0 is (x, -y)
The reflection of (x, y) across line y=x is (y, x)
The reflection of (x, y) across line y=-x is (-y, -x)
The reflection of (x, y) across line y=-3 is (x, -6-y)
D
The reflection of (x, y) across line y=0 is (x, -y)
The reflection of (x, y) across line y=x is (y, x)
The reflection of (x, y) across line y=-x is (-y, -x)
The reflection of (x, y) across line y=-3 is (x, -6-y)
D
shridhar786
The point R in the xy-plane with coordinates (–8, 3) is reflected over the line ll, giving the point R’ with coordinates (–3, 8). What is the equation of the line ll?
(A) x = 0
(B) y = 0
(C) y = x
(D) y = – x
(E) y = –3
(A) x = 0
(B) y = 0
(C) y = x
(D) y = – x
(E) y = –3
