Solution assignment 04 Tangent line to graph

Calculate the equation of the line through the point $P(1,2)$ with slope $3$ .

We can calculate the equation of this line by using the following formula:

$y-y_0=m(x-x_0)$

with:

$(x_0,y_0)=(1,2)$ and $m=3$

and thus we get:

$y-2=3(x-1)$

or:

$y=3x-1$

which is the equation of the required line.