Question

PLZ HELP ASAP!! 100 points!!!

Are these examples of direct variation? Please explain

Answer 1

mathematical relationship between two variables that can be expressed by an equation in which one variable is equal to a constant times the other.

8 - direct variation Since the equation can be written in the form y=kx. , y varies directly with x and k. The constant of variation, k, is 3.25

9 - When solving for y, y=5x-9 so y doesn't vary directly with x.

y doesn't vary directly with x

10 - direct variation Since the equation can be written in the form y=kx, y varies directly with x and k. The constant of variation, k, is -2.4

Answer 2

• 8 and 10 - yes, 9 - no

Explanation:

Direct variation formula:

• y = kx, where k- variation coefficient

#8

• 16.25 = 5*3.25, yes, same format as above

#9

• y = 5x - 9, no, not same format as above

#10

• y = -2.4x, yes, same format as above