a counterclockwise rotation about the origin of 90°
The coordinates of P(3, 3), Q(5, 3), R(5, 7)
The coordinates of P'(- 3, 3 ), Q'(- 3, 5), R'(- 7, 5)
Note that the y-coordinate of the image is the negative of the original, while the x-coordinate of the original becomes the y-coordinate of the image
The rotation which does this is a counterclockwise rotation about the origin of 90°
a point (x, y ) → (- y, x )
The total electric energy bill for the month is 
<u>Solution:
</u>
Given that
Electric energy consumed by family in a month = 1303 kWh
Power Company charges 
per kilowatt hour
Need to calculate total electric energy bill for the month.
Price of 1 kilowatt hour =
Total electric energy bill for the month = Price of Electric energy consumed by family in a month = Price of 1303 kilowatt hour =
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