8th Grade Mathematics - Important Vocabulary Wor ...

A circular movement opposite to the direction of the movement of the hands of a clock.

For real variables x and y, y varies directly with x if y = Kx for a constant K, K ≠ 0. K is called the constant of proportionality.

Two lines in a plane that never intersect.

A letter or symbol that represents an unknown quantity.

The point of intersection of a graph with the y-axis.

A transformation that moves a figure along a line in a plane but does not alter its size or shape.

The side opposite the right angle in a right triangle.

A decimal number that neither repeats nor terminates. A number that can not be expressed as an integer divided by an integer.

The variable in a function representing the elements of the domain; the input values.

The set of input values in a function.

A pair of numbers that represent the coordinates of a point in the coordinate plane with the first number measured along the horizontal scale and the second along the vertical scale.

A collection of objects or elements.

For real variables x and y, y varies inversely with x if yx = K and K is a non-zero constant.

The variable in a function representing the elements of the range; the output values.

The set of results obtained by applying a function rule to a set of input values.

A triangle that has one obtuse angle.

In a triangle it is the segment from a vertex perpendicular to the selected base.

If (x1, y1) and (x2, y2) are two points on a line, then the slope of the line is the ratio m = rise/run =
y/
x = (y2−y1)/(x2−x1)

Algebraic terms that contain the same variables and for each variable the power is the same.

A number’s distance from zero.

The point with coordinate 0 on a number line; the point with coordinates (0, 0) in the coordinate plane.

A math sentence using the equal sign to state that two expressions represent the same number.

An angle whose measure is greater than 90 and less than 180 degrees.

numbers written in the form a × 10^n where 1 ≤ a ≤ 10 and n is an integer.

An angle whose measure is greater than 0 and less than 90 degrees.

The vertical axis of a coordinate plane.

The values of the domain of a function.

An angle formed by the intersection perpendicular lines; an angle with a measure of 90 deg.

A number that can be written as a/b where a is an integer and b is a natural number.