HELP PLS>>> The vector (3, - 7) ) is rotated by an angle of (3pi)/4 radians and then reflected across the y-axis. If the resulting vector is [a/b], then a=__ and b=__

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Step-by-step explanation:

First, the vector must be transformed into its polar form:

Let assume that vector is rotated counterclockwise. The new angle is:

Which is coterminal with . The reflection across y-axis is:

The equivalent vector in rectangular coordinates is:

 a = -2.83 and b = 7.07.

Step-by-step explanation: I got this correct on Edmentum.

Also, to get the answer you first multiply

The you multiply the answer which is  then you get the answer or  -2.83 and 7.07. You can use a calculator like the one on ma th wa y to make multiplication easier, but when you do multiply always  put the 2x2 equation before the 2x1 to get another vector matrix.

it would open into a square depending on the type of envelope i’m not sure about the second part

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