Match the terms to their correct definitions. 1. ordered pair the value of y when x = 0 2. range terms on the horizontal axis 3. slope vehicle operating costs that do not vary from month to month 4. y intercept vehicle operating costs that vary with usage of the vehicle 5. constant returns part of the price 6. discount variable in an equation that can take have different values 7. fixed cost lowers the purchase price of a vehicle 8. independent variable element in an equation that does not change value 9. rebate terms on the vertical axis 10. variable cost an expression written (domain term, range term) 11. function ratio of the vertical change to the horizontal change of a line 12. domain for any value in the domain there is one and only one value in the range