Which statement is true about the graphs of the two lines y= -4/5x+2 and y= -5/4x - 1/2?

Option 3 is the right answer.

Step-by-step explanation:

For the given lines y = -4/5x+2 and y = -5/4x - 1/2

we have to identify whether lines are parallel or perpendicular.

As we know if two lines are perpendicular then gradients of two lines will in the form of

and if the lines are parallel then the gradients of the lines will be same.

Here m1 = -4/5 and m2 = -5/4

Therefore

and  

So both the lines are neither parallel nor perpendicular to each other.

Option 3 is the right answer.

72 is the answer to this problem

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)