Question

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A taxicab starts at (1, -2) on the grid. It goes 3 blocks west and 4 blocks north to pick up a passenger. Then it goes 8 blocks east and 1 block south and drops off the passenger. Which rule will bring the taxicab back to its starting position?

A (x, y) (x - 3, y - 5)
B (x, y) (x - 5, y - 3)
C (x, y) (x + 3, y + 5)
D (x, y) (x + 5, y + 3)

Answer 1

B.

Answer 2

Can you explain your way?

Answer 3

who me ?

Answer 4

No I wanted to ask robtobey

Answer 5

Using Mathematica notation for a vector, {x,y} I summed the movement vectors starting from {1,-2}.

{1, -2} + {-3, 4} + {8, -1} = {6, 1}
In order to return to the starting point one would have to add {-5, -3} to {6, 1}.

Answer 6

Thank you for the medal.