What is the relationship between two lines whose slopes are −7 and 1/7?
a) The lines are parallel to each other
b) The lines are mirror images of each other, reflected over the xaxis
c) The lines always cross at the origin.
d) The lines are mirror images of each other, reflected over the yaxis.
e) The lines are perpendicular to each other.
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2 answers

the lines are perpendicular to each other
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answered by Fatima 
I am going to graph
y = 7x and y = (1/7)x for you
www.wolframalpha.com/input/?i=plot+y+%3D+7x+%2B1,+y+%3D+(1%2F7)x+%2B1+from+10+to+10
let you decide how they are related.
Notice Wolfram used a different scale for the yaxis than the xaxis,
making y = (1/7)x look like it falls on the xaxis. It doesn't !
suggestion: plot a few points for each one, draw the straight line on a 1:1 scale grid. 👍
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answered by Reiny
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