It is the number of blooms per ounce of fertilizer added based on the context.
The standard slope of a line is expresed as y = mx + b
Given the eqeuation y = 1.345x + 5
mx = 1.345x
m = 1.345
This shows that 1.345 is the slope of the line which means the number of blooms per ounce of fertilizer added based on the context.
Learn more on slopes here: https://brainly.com/question/3493733