Are the graphs of the lines in the pair parallel? Explain.

Find the slope of a line parallel to 3x - y = 1

A) - 3

B) - 1/3

C) 1/3

D) 3

The slope of the line given its equation can be calculated by,

m = - A/B

where m is the slope, A and B are the numerical coefficients of x and y terms, respectively.

Substituting the known values,

m = - 3/-1 = 3

Thus, the slope of the line is 3. The answer is letter D.