Which two pairs of points lie on perpendicular lines?
a. (-6,-,18)
b. (6,,12)
c. (-4,,3)

(-6,-8),(7,18) and (-4,6),(2,3) lie on perpendicular lines

Step-by-step explanation:

we know that

The formula to calculate the slope between two points is equal to

step 1

Find the slope of the pair (-6,-8),(7,18)

substitute

step 2

Find the slope of the pair (6,4),(4,12)

substitute

step 3

Find the slope of the pair (-4,6),(2,3)

substitute

step 4

Remember that

If two lines are perpendicular, then their slopes are opposite reciprocal (the product of their slopes is equal to -1)

In this problem

and are opposite reciprocal

therefore

(-6,-8),(7,18) and (-4,6),(2,3) lie on perpendicular lines

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80