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- Solve the system of equations $3x-y+2z=4, 4x+z=7$. Start by picking one of the variables to equal $t$, and then solve for all the others in terms of $t$.
- Find the distance between the two points $(3,5,-2)$ and $(-1,6,4)$.
- Give an equation of the sphere that passes through the point $(3,5,-2)$ and has the center $(-1,6,4)$.
- For this one, have everyone in the group use chalk at the same time. In 3D, plot the points $(1,2,0)$, $(1,0,3)$, $(0,2,3)$, $(1,2,3)$, $(-2,4,-3)$.
- Find the component form of the vector that starts at $(4,-3)$ and ends at $(2,-2)$.
- Give a unit vector that points in the same direction as the previous. Then give a vector of length 3 that points in the same direction.
- Plot the vector valued function $\vec r(t) = (-2,1)t+(4,-3)$ for $0\leq t\leq 3$.
- Give the component form of a vector that points from $(1,2,3)$ to $(-2,4,9)$.
- Give a vector equation of the line that passes through the point $(1,2,3)$ and $(-2,4,9)$.
- Use the law of cosines to find the angle between the vectors $(-2,1)$ and $(1,3)$.
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