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Tardigrade
Question
Mathematics
The two lines l x+my=n and l'x+m'y=n' are perpendicular if
Q. The two lines
l
x
+
m
y
=
n
and
l
′
x
+
m
′
y
=
n
′
are perpendicular if
4577
185
KCET
KCET 2020
Straight Lines
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A
ll'+mm'=0
32%
B
lm'+ml'
19%
C
lm+l'm'=0
29%
D
lm'+ml'=0
19%
Solution:
Product of slopes
=
−
1
⇒
l
l
′′
+
m
m
′
=
0