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The coordinates of point Y(name this point Y) can be found by: $(\frac{x_1+\gamma x_2}{1+\gamma}, \frac{y_1+\gamma y_2}{1+\gamma})$, where gamma($\gamma$) is the ratio of the coordinates(1:3).

$(\frac{7+\frac{1}{3}*2}{1+\frac{1}{3}},\frac{4+\frac{1}{3}*5}{1+\frac{1}{3}})$=$(\frac{23}{4}, \frac{17}{4}).$