Algebra Terms

7. A straight line, or an equation or expression whose graph is a straight line. If m and b are constants, then mx+b is a linear expression, and a function f defined by f(x)=mx+b is a linear function.
8. Decreasing toward 0 due to a variable in an exponent, such as in y=2−x.
10. A constant that a variable or expression is multiplied by.
12. A line that you can flip (or reflect) a graph across that results in the same graph.
14. A letter (like x) that we can use to mean different numbers at different times.
15. The horizontal line running through the origin on a coordinate plane.
16. The point where a parabola crosses its axis of symmetry, or an end of a side of a polygon, or the corner point of an angle.
17. An image formed by plotting the solutions to an equation or inequality, or some other set of pairs of numbers, on a coordinate plane. To graph an expression containing the variable x, set y equal to that expression.
18. In mathematics, a rectangular arrangement of rows and columns.
19. The speed at which a variable changes over a period of time. This is given by the change in the variable divided by the change in (amount of) time.
20. Rigid motion across a fixed line AB in a plane, like a mirror image.

1. A point where a line or curve meets the vertical axis (the y-axis). The y-intercept of the line y=mx+b is the point (0,b).
2. The form y=mx+b for a linear equation, where m and b are constants. The numbers m and b give the slope and y-intercept of the line that is the graph of that equation.
3. The set of inputs (x-coordinates) of a relation or function.
4. A number that measures how steep a line is. It shows the amount of change in the height of the line as you go 1 unit to the right. The slope of the line y=mx+b is m.
5. An expression or equation in which the highest power of a variable has exponent 2.
6. The values of x where an expression is zero. These are the x-coordinates of the x-intercepts of the expression’s graph. For a polynomial expression, these are usually called roots.
9. The vertical line running through the origin on a coordinate plane.
11. For a linear equation, the form Ax+By=C where A, B, and C are constants. For a quadratic equation, either the form y=ax2+bx+c or ax2+bx+c=0, where a, b, and c are constants.
13. A point where a curve meets the horizontal axis (the x-axis).