Final answer:
Ivy earns approximately $8.50 per hour.
Step-by-step explanation:
To find the amount Ivy earns per hour, we can use the formula for a linear equation: y = mx + b, where y is the dependent variable (the amount earned), x is the independent variable (the number of hours), m is the slope, and b is the y-intercept.
From the given points, we can calculate the slope (m) using the formula: m = (y₂ - y₁) / (x₂ - x₁).
Using the points (2, 17) and (5, 42.50), we have m = (42.50 - 17) / (5 - 2) = 25.50 / 3 = 8.50.
So, Ivy earns approximately $8.50 per hour.