1. ordered pair a number that is greater than zero
2. x-axis

the intersection of the x-axis and y-axis
3. term

to replace a variable in a mathematical expression with an actual value
4. y-axis

a system for simplifying expressions that ensures that there is only one right answer
5. order of operations

the horizontal distance from the y-axis; written first in an ordered pair
6. variable

a group of two numbers written in the order (x, y), where the first value represents the input for a function and the second value represents the corresponding output
7. y-coordinate

the vertical distance from the x-axis; written second in an ordered pair
8. positive number

a letter used to represent an unknown number or quantity
9. sequence

the horizontal axis on the coordinate plane
10. output

a value generated by a function when an input value is substituted into the function and evaluated
11. substitute

a list of numbers
12. x-coordinate

the vertical axis on the coordinate plane
13. origin

a member (or number) in a sequence