Algebra Review

3. To substitute number values into an expression.
8. The top part of a fraction is called the_______________.
12. A letter used to represent a number value in an expression or an equation.
13. A value that does not change is called a ______________.
15. The ________________ property states a + b = b + a.
17. A ______________ number is a real number that is less than zero.
18. A ________________ number can be expressed as the ratio of two integers.
19. The value of y at the point where a curve crosses the y-axis.
20. The _________________ property states a(b + c) = ab + ac.

1. One of the quarters of the plane of the Cartesian coordinate system is called a ________________.
2. ______________ is the set of numbers containing zero, the natural numbers, and all the negatives of the natural numbers.
4. A ________________ number that cannot be expressed as the ratio of two integers.
5. The point (0, 0) on a coordinate plane, where the x-axis and the y-axis intersect.
6. A real number greater than zero is a________________.
7. A mathematical statement that says that two expressions have the same value; any number sentence with an = is called a____________.
9. The__________________property states (a + b) + c = a + (b + c).
10. _____________ lines have no solutions.
11. The bottom part of a fraction.
14. The steepness of a line expressed as a ratio, using any two points on the line.
16. The ____________ property of zero is the sum of any number and 0 is that number.