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5 votes
Brandie lives on the twelfth floor of her apartment building. She walks down 2 flights to visit a friend, then up 3 flights to deliver a message to a neighbor. Which integer best represents the number of flights Brandie must walk to get back to her starting point?

A). -12
B). -1
C). 5
D). 7

User Forzaa
by
8.3k points

1 Answer

4 votes

Answer:

Option (B) is the correct answer.

Explanation:

Let 'x' the starting point be

She walks down 2 flights to visit a friend.

so walking down means we need to add 2 units to the starting point x


x+2

Then he walks up 3 flights to deliver a message to a neighbor.

now subtracting 3 units from (x+2)


x + 2 - 3 = -1

x = -1 means now he is UP to 1 point where he started his flight.

Thus, he needs to walk down 1 more flight to reach her starting point

Thus, -1 is the number of flights Brandie must walk to get back to her starting point.

Therefore, option (B) is the correct answer.

User Raj Shenoy
by
8.2k points
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