Answer
$$y-11 = 3(x-3)$$
Work Step by Step
We first find the slope:
$$m = \frac{y_2-y_1}{x_2-x_1}$$
$$m = \frac{11-5}{3-1}= 3$$
We then use point slope form. Plugging in either point will work here:
$$y_2-y_1=m(x_2-x_1)$$
$$y-11 = 3(x-3)$$