Answer:
x-axis: Amount of candy sold
y- axis: Amount of money made
Billy is making $0.20 per candy bar.
Linear function: y=3/5x-6
Billy sold 50 candy bars if he made $24.
The x-intercept represents the point when he will earn a profit because at point (5,-3) he sold 5 candy bars but he still made a loss of $3.