Crazycookie1 Crazycookie1

02-01-2020
Mathematics

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Help, I know D2 is the dilation of 2? And I know the rotation is 90 degrees but I’m not to sure on how to find my answer? Help please

Help I know D2 is the dilation of 2 And I know the rotation is 90 degrees but Im not to sure on how to find my answer Help please class=

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MathPhys MathPhys

02-01-2020

Answer:

(-18, 2)

Step-by-step explanation:

To rotate a point by 90°:

R₉₀ (x, y) = (-y, x)

R₉₀ (1, 9) = (-9, 1)

To dilate by 2:

D₂ (x, y) = (2x, 2y)

D₂ (-9, 1) = (-18, 2)

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