Answer:
B.
Explanation:
Again, to find the equation of the line, we need to find the slope and y-intercept. First, let's find the slope. Let (-1,5) be x₁ and y₁ respectively and (1,3) be x₂ and y₂, respectively. So:

So the slope is -1.
Now, to find the y-intercept, we can use the point-slope form. I'm going to keep using (-1,5) as the coordinate. Thus:

This is slope-intercept form. We want the answer to be in standard form, where:

A, B, and C are integers (and, conventionally, A is positive).
Thus, we need to rearrange the terms:

The answer is B.