Andrew R.

3. something having to do with a line
7. a mathematical statement with an 'equal to' symbol between two expressions that have equal values.
9. any real number that cannot be written as a fraction
11. decimal decimals that have a finite number of decimal places
12. a statement involving at least two different numbers (known or unknown) and at least one operation
14. a quantity that may be changed according to the mathematical problem
15. the secondary or vertical axis of a system of coordinates, points along which have a value of zero for all other coordinates.

1. decimal a decimal number that contains a digit or group of digits that repeat endlessly
2. a part of a whole
4. solution An equation has no solution if solving it leads to a false statement,
5. such which does not form a straight line.
6. he relationship between two values that are not equal
8. solution there is only one value for the variable that makes the equation true
10. a number that can be expressed as a fraction of two integers, where the denominator is not zero
13. the horizontal plane in a Cartesian coordinate system