Answer:
y = 
 x + 1
Explanation:
The slope-intercept formula is y = mx + b, where m is the slope and b is the y-intercept.
Find the slope:
Given two points (x1, x2) and (y1, y2), the formula is
m = 

The points given to us are (0, 1) and (4, -1), so:
m = 

We know that the y-intercept is 1, so the equation is:
y = 
 x + 1