What is the image of (-9, -1) after a dilation by a scale factor of 2 centered at the
origin?

(- 18, - 2 )

Step-by-step explanation:

Since the dilatation is centred at the origin then multiply each of the original coordinates by the scale factor for image, that is

(- 9, - 1 ) → (2 × - 9, 2 × - 1 ) → (- 18, - 2 )

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

this answer is !