The relationship between the slopes of two lines that are parallel is
the relationship between the slopes of two lines that are perpendicular is
a line that is parallel to a line whose slope is 2 has slope
a line that is perpendicular to a line whose slope is 2 has slope

what must be done to make the graphs of two perpendicular lines appear to intersect at right angles when they are graphed using a graphing utility?

The slopes of 2 lines that are parallel will be the same. the slopes of 2 lines that are perpendicular will have negative reciprocal slopes.
parallel to a line with slope 2 is 2 (because parallel lines have the same slope). perpendicular to a line with slope 2 is -1/2 (the negative reciprocal...to find the negative reciprocal, just flip the slope of the original equation and change the sign)

5*5*5*5*5*5*5=78,125

7*7*7*7*7=16,807

5+5+5+5+5+5+5=35

7+7+7+7+7=35

try

5+5+5+5+5+5+5+5+5+5+5+5+5+5+5=75

Step-by-step explanation: