Find the equation of a line with slope -1 and cutting of fan intercept of 4 units on negative direction of y-axis.

Explanation

To find the equation of a line with a slope of -1 and a y-intercept of -4, we can follow these steps:

### Step 1: Understand the slope and y-intercept
The slope (m) of the line is given as -1, and the y-intercept (c) is -4. The y-intercept is the point where the line crosses the y-axis.

### Step 2: Use the slope-intercept form of the equation
The slope-intercept form of a line is given by the equation:
\[ y = mx + c \]
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