Yefim S. answered 01/11/22
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Let this Poit is M(a, b). Then <a + 1, b + 9) = 2/3<3,15> = <2, 10>.
So, a + 1 = 2 and b + 9 = 10;
a = 1 and b = 1.
Point M(1, 1)