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Verified answer
X(a , b)--270°----> x'(b , -a)B(2 , 1)--270°----> B'(1 , -2)
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|x'| = |0 1| × |x|
|y'|....|-1 0|...|y|
|x'| = |0 1| × |2|
|y'|....|-1 0|...|1 |
|x'| = |0×2 + 1×1|
|y'|....|-1×2 + 0×1|
|x'| = |0 + 1|
|y'|....|-2+0|
|x'| = | 1 |
|y'|....|-2|
B'(1 , -2)