Question

The equation of the line of best fit of a scatter plot is y = −7x − 2. What is the the y-intercept?

Answer 1

The equation of the line is in the form of

                                   Y = 'S'x + 'P'

Whenever the equation of the line is written in that form, you can read
the y-intercept straight from it.   In that form, the 'P' is the y-intercept.

In the equation in your question, the y-intercept is  -2 .

When you draw the graph of that equation, it will cross the y-axis at y = -2.

Answer 2

Negative Two would be your answer.