Across
- 1. two lines that lie exactly on top of each other
- 4. a value that makes an equation true
- 8. any value for the variable in an equation would make it true
- 9. two or more equations working together
- 10. lines that are always the same distance apart and never touch
- 12. process of solving equations by cancelling unknowns
Down
- 2. when there is no real answer to an equation
- 3. there is no set of values for the unknowns that works for all of the equations in a system
- 5. used to solve a system of two equations with two variables by rearranging one equation and substituting it into the second
- 6. three or more points on the path of the same straight line
- 7. when there is only one way to solve an equation
- 11. lines intersecting at 90 degrees