That depends is it 3x + or - 9?
Without an equality sign it is not an equation but if you mean y = 3x-1 then it is a straight line equation
If you mean: y = 3x+2 then the parallel line will be y = 3x-3
If you mean: y=3x-4 and the point (2, 1) then the perpendicular equation is 3y=-x+5
If you mean y = 3x-2 then it is a straight line equation whereas 3 is the slope and -2 is the y intercept
Assuming that you meant that the equation is y=3x+1, the slope is 3. This is because the equation of any line in the form of y=mx+b has a slope of "m". Therefore, the value of m in this equation is 3.
If you mean: y = 3x-4 then it is a straight line equation whose slope is 3 and its y intercept is -4
9
If you mean: y = 3x+3 then the slope is 3 and the y intercept is 3
7
5
If you mean: y = 3x+5 then it is a straight line equation that can be plotted on a graph whereas 3 is the slope and 5 is the y intercept