In these two lectures we introduce the geometric interpretation of linear equations. We recall vectors in n-dimensional Euclidean space, how to add them and scale them. Using these ideas we introduce the parametric equation of a line in n-dimensional Euclidean space. Given the parametric equations of two lines in 3-dimensions we obtain a system of three linear equations in two unknowns that determine the intersection properties of the lines. Using the dot product we describe the length of a vector and the angle between two vectors.