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 x-axis
c) The lines always cross at the origin.
d) The lines are mirror images of each other, reflected over the y-axis.
e) The lines are perpendicular to each other.
the lines are perpendicular to each other
I am going to graph
y = -7x and y = (1/7)x for you
let you decide how they are related.
Notice Wolfram used a different scale for the y-axis than the x-axis,
making y = (1/7)x look like it falls on the x-axis. 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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