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Weighted averages

Point A\pink{A} is at (10,8)(-10, 8) and point B\blue{B} is at (7.5,3)(7.5, 3).
If point M=(1t)A+tB=(4,4)\purple{M} = (1 - t)\pink{A} + t\blue{B} = (4, 4), what is the value of tt?
You can use the interactive diagram below to help you :