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Morgarella [4.7K]
2 years ago
9

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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