The slope of all lines parallel to the line 3x + 7y = -7 is 3/7.
To find the slope of the line 3x + 7y = -7, we can use the slope-intercept formula y = mx + b, where m is the slope.
We can rearrange the equation 3x + 7y = -7 to the slope-intercept form 7y = -3x -7.
We can then divide both sides of the equation by 7 to get the slope, m = -3/7.
Therefore, the slope of all lines parallel to the line 3x + 7y = -7 is 3/7.
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