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

answer: 94

step-by-step explanation: 79+91+92+94+94 = 450 divided by 5 (since there are 5 number that are being added) = 90

the speed is   miles per hour > is false

step-by-step explanation:

we know that  

a relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form or

in a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin

the graph shown in the figure represent a direct variation

the slope of the line represent the speed

for the point

substitute the values of x and y

the linear equation is equal to

statements

case a) it takes hours to go miles

the statement is true

because

substitute

for

find the value of y in the linear equation

> is correct

case b) the speed is   miles per hour

the statement is false

because the speed is

case c) the unit rate for the trip is

the statement is true

because the speed is equal to the slope of the linear equation

case d) it took minutes to go the first miles

the statement is true

because

substitute

for

find the value of y in the linear equation

> is correct