26 terms

Essential Math Concepts are a reorganization of the Grade 7 California standards into eight categories. The topics comprise 70% of the CST questions.

coordinate plane

A plane formed by two perpendicular numbered lines called axes.

domain

The set of the first elements of a relation: In the relation {(2,20), (3,30)}, the domain is {2, 3}.

function

A relation in which each element in the domain is matched with only one element of the range: [(1,4) (2,5)] is a function, but [(1,4) (2,4)] is not because the same y value is shared by different x values.

function rule

An equation that describes a function.

line of best fit

A straight line used as a best approximation of all the points in a scatter-plot graph.

linear equation

An equation that can be represented by a straight line on the coordinate plane.

negative correlation

In a scatterplot, a pattern formed from data points shows the values of one variable increase as the values of the other variable decrease.

no correlation

In a scatterplot, data points are scattered, and no pattern can be formed from the points, a correlation of "0"

ordered pair

A pair of numbers used to locate a point on a coordinate plane: (3,2) represents 3 spaces to the right of zero and 2 spaces up.

origin

The point on the coordinate plane where the x-axis and the y-axis intersect, (0,0).

positive correlation

When values of two sets of data increase together.

quadrant

One of the four regions of the coordinate plane.

range

The difference between the greatest and the least numbers in a set of data: The range is 13 because 83-70=13.

relation

A set of ordered pairs: (5,1) (10,2) (15,3).

scatter plot

A graph with points plotted that attempt to show a relationship between two variables.

slope

The measure of the steepness of a line; the ratio of vertical change (rise) to horizontal change (run).

slope-intercept form

A linear equation in the setup of y=mx+b.

solution

The value that makes two sides of an equation equal: y+7=9; 2 is the solution.

system of linear equations

Two or more equations that involve two or more variables: y=2x-1 and y=x+1

vertical line test

If a vertical line crosses two or more points on the graph, the relation is not a function.

x-axis

The horizontal axis on the coordinate plane.

x-coordinate

The first number in an ordered pair: (3, 2) 3 is the x-coordinate

x-intercept

The point where a function line crosses the x-axis.

y-axis

The vertical axis on the coordinate plane.

y-coordinate

The second number in an ordered pair: (3, 2) 2 is the y-coordinate.

y-intercept

The point where a function line crosses the y-axis.