2 years ago

Can somebody help me with this

Mathematics

2 answers:

eimsori [14]2 years ago

3 0

Answer:

If AB and CD are perpendicular, (slope of AB) x (slope of CD) = -1

9/a = -1

a = -9

murzikaleks [220]2 years ago

3 0

Answer:

-9

Step-by-step explanation:

flip and change the sign of $\frac{3}{4}$

$\frac{4}{-3}$

set equal to each other

$\frac{4}{-3}$ = $\frac{12}{a}$

cross multiply

4a = -36

divide by 4

a = -9

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Can somebody help me with this​

Can somebody help me with this