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.