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The point is given with respect to the standard basis vectors i and j. If we draw the xy-plane with new basis vectors u and

v, then what are the coordinates of the point with respect to this new basis? Hint: Sketch these new basis vectors on the xy-plane and look for what combination will correspond to point.

a) u and v
b) i and u
c) j and v
d) i and j

1 Answer

4 votes

Final answer:

The coordinates of the point with respect to the new basis i and j will remain the same as the original coordinates with respect to the standard basis i and j.

Step-by-step explanation:

In a rectangular (Cartesian) xy-coordinate system in a plane, a point is described by a pair of coordinates (x, y). In the given question, the point is described with respect to the standard basis vectors i and j. If we draw the xy-plane with new basis vectors u and v, the coordinates of the point with respect to this new basis can be found as a combination of the new basis vectors.

a) u and v

Answer: The coordinates of the point with respect to the new basis u and v are found by expressing the point as a linear combination of u and v.

b) i and u

Answer: Since the question states that the new basis vectors are u and v, using i and u as the basis vectors would not correspond to the new basis and hence would not give the correct coordinates.

c) j and v

Answer: Using j and v as the basis vectors would not correspond to the new basis and hence would not give the correct coordinates.

d) i and j

Answer: The coordinates of the point with respect to the new basis i and j will remain the same as the original coordinates with respect to the standard basis i and j. Therefore, the correct choice for the new basis vectors is option d) i and j.

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