If triangle abc defined by the coordinates a(1, 1), b(9, 1), c(1, 9) is dilated by a scale factor of 1/2, with resulting vertex b' at (5, 1), what is the center of the dilation?
a) (0, 0)
b) (1, 1)
c) (-2, -2)
d) (-1, -1)

B.

Step-by-step explanation:  (1, 1)

In this case, the center of dilation is a vertex of the original figure.

The center of dilation is a fixed point in the plane about which all points are expanded or contracted.

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i cant see the graph

step-by-step explanation: