SOLUTION: consider the line 3x-9y=-7 What is the slope of a line perpendicular to this line? What is the slope of a line parallel to this line?

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Question 1086074: consider the line 3x-9y=-7 What is the slope of a line perpendicular to this line? What is the slope of a line parallel to this line?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

3x-9y=-7
3x%2B7=9y
y=%283%2F9%29x%2B7%2F9
y=%281%2F3%29x%2B7%2F9 -> the slope of this line is %281%2F3%29
the slope of a line perpendicular to this line will be negative reciprocal:
-%281%2F%281%2F3%29%29=-3

and the slope of a line parallel to this line will be same: %281%2F3%29