What’s the equation that passes through the points (19,0) and (0,16)

Answer 1

Your question isn't completely clear, but since this is Linear Algebra, you're probably asking for an equation of the line passing through these two points. Such an equation is not unique, but a standard way to do this in the spirit of Linear Algebra is the vector equation:

X = P + t(Q - P)

Here X is a point/vector on the line, t is an arbitrary real number, and P and Q are the two given points/vectors (it doesn't matter which one is which). With the given information, this would become:

X = <19,0> + t(<0,16> - <19,0>) = ... = <19-19t, 16t>