Answer:
y = -x + 4
The correct option is B
Step-by-step explanation:
Given the point (1, 3) and (3, 1)
The equation of a line is given as:
y = mx + b
Where m is the slope and b is the y-intercept.
To obtain the slope, we use the formula:

The equation now becomes:
y = -x + b
We can use the point (1, 3) to obtain the y-intercept. Using x = 1, and y = 3
3 = -1 + b
b = 3 + 1 = 4
Finally, we can write the equation as:
y = -x + 4