Question

if two lines intersect at right angle,then the product of their slope is

Answer 1

Answer:

-1 will be the answer

Step-by-step explanation:

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Answer 2

Answer:

The answer is $-1$

Step-by-step explanation:

Concept :

If $\theta$ angle between the lines having slopes $m_1$ and $m_2$,

then  $\tan\theta=|\frac{m_1-m_2}{1+m_1m_2}|$

Thus if lines intersect at right angle, then $\tan\theta$ will be undefined

$\Rightarrow 1+m_1m_2=0$

$\Rightarrow m_1m_2=-1=$ Product of slopes