Yes they are equivalent 18:9 simplified by 9 is 2:1
heres a video link
https://virtualnerd.com/algebra-1/linear-equation-analysis/slope-rate-of-change/understanding-slope/rate-of-change-two-points-table
The population of the group in 2019 is 2,134,000 people
Let P represent the population in thousands of people in the year t after 2011
Given the equation:

a) The population of the group in 2019, that is t = 8(2019 - 2011):

b) The population of the group in 2029, that is t = 18(2029 - 2011):

The population of the group in 2019 is 2,134,000 people
Find out more on equation at: brainly.com/question/2972832
Answer:
It's a reflection transformation
Step-by-step explanation:
The reason I know is because a reflection is a shape flipped around. This shape is flipped around.
If this helps, can i have brainliest?