The single transformation that maps triangle a onto triangle b is the reflection of y=x.
What is single transformation?
This is known to be the mix up or the combination of transformations that is said to be seen as one transformation.
Note that in the image attached, when reflection of y axis is said to be cast on the x - axis, one can see that triangle a can be maps onto triangle b and thus:
The single transformation that maps triangle a onto triangle b is the reflection of y=x.
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