Answer:
m = -1
y-int (0, 5)
General Formulas and Concepts:
Slope-Intercept Form: y = mx + b 
m - slope 
b - y-intercept
The y-intercept is the y value when x = 0. 
Another way to reword that is when the graph crosses the y-axis. 
Explanation:
Step 1: Define equation
y = -x + 5
Step 2: Define parts
Slope m = -1
y-intercept = 5