Answer:
-4
Explanation:
Assuming this is slope-intercept form (y = mx + b), and the obj box is an accident and shouldn't be there, you can break the equation into pieces.
m represents the slope (how many units up the line goes for every unit to the right. A negative slope goes backwards.) of the line, which is -4 in this equation
b represents the y-intercept (where the line crosses over x = 0, basically how high the line is when it's in the center of your graph, and crosses the (commonly bolded) line going up and down.) , which in this case is 5.
Hope this helps!