In point-slope form, the equation of a line is expressed as:
\[ y - y_1 = m(x - x_1) \]
where \( (x_1, y_1) \) is a point on the line, and \( m \) is the slope.
From the given information, we have:
- The slope \( m = -3 \)
- The x-coordinate \( x_1 = 1 \)
The missing value is \( y_1 \), which is the y-coordinate of the point on the graph.
To find \( y_1 \), you would need the y-coordinate corresponding to the point \( (1, y_1) \) on the graph. Check the graph to find the corresponding y-value for \( x = 1 \) to fill in the missing value in the equation.
If the graph is not provided, I'll need the y-coordinate to complete the point-slope form.