# 8th Grade Pre-Algebra Vocabulary

## 46 terms · The 30 North Carolina core curriculum vocabulary for 8th Grade Pre-Algebra

### approximate

To bring close or near to the exact answer

### ascending

Sorting data in alphabetical order from A-Z or numerical order from 0-9.

### biased

favoring one person or side over another

without bias

### correlation

The description of the relationship between two data sets

### cube roots

A number raised to the third power

### dependent

Events for which the outcome of one event affects the probability of the other

### descending

Sorting data the opposite of ascending order. (Z-A & 9-0)

### dilation

A transformation that enlarges or reduces a figure

### enlargement

An increase in size of all dimensions in the same proportions

### equivalent forms of equations

Having the same value

### estimate

An answer that is close to the exact answer

### function

An input-output relationship that has exactly one output for each input

### hypotenuse

In a right triangle, the side opposite the right angle

### image

A figure resulting from a transformation

### independent

Events fro which the outcome of one event does not affect the probability of the other

### indirect measurement

The technique of using similar figures and proportions to find a measure

### input

The value substituted into an expression or function

### intercepts

The point which a relation intersects the x- or y-axis

### irrational

A number that cannot be expressed as a ratio of two intergers or as a repeating or terminating decimal

### line of best fit

A stright line that comes closest to the points on a scatter plot

### linear equation

An equation whose solutions form a straight line

### misleading

tending to give a wrong idea, often on purpose

### ordered pairs

A pair of numbers that can be used to locate a point on a coordinate plane

### output

The value that results from the substitution of a given input into an expression or function

y-y₁= m(x-x₁)

### prediction

what you think will happen

### pre-image

The original figure in a transformation.

a²+b²=c²

### pythagorean triples

3,4,5 and 5,12,13 and 8,15,17 and 7,24,25

### radicals

Symbols used to refer to the root of a number or term

### range

The difference between the greatest and least values in a data set

### rational

Any number that can be expressed as a ratio of two intergers

### real numbers

A rational or irrational number

### reduction

the act of decreasing or reducing something

### relationship

The comparison of two pieces of information using logical operators: less than (<), greater than (>), equal to (=)

### sample

A part of a population

### scale

The ratio between two sets of measurements

### scale factor

The ratio used to enlarge or reduce similar figures

### scatter plot

a graph with points plotted to show a possible relationship between two sets of data

### slope

The steepness of a line on a graph; the rise divided by the run

y=mx+b

### square roots

multiplying a number by itself

### standard form

Using digits to write numbers

### trend

a general direction in which something tends to move

### trend line

A line on a scatterplot that helps show the correlation between data sets more clearly