The Equation $\vec { r } = 2 \vec { i } + 5 \vec { j } + 3 \vec { k } + t \vec { i } - \vec { j } + 2 \vec { k } )$

Short Answer

The equation $\vec { r } = 2 \vec { i } + 5 \vec { j } + 3 \vec { k } + t \vec { i } - \vec { j } + 2 \vec { k } )$ parameterizes a line through the point (4, 3, 7).
What is the value of t at this point?