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Prealgebra 2e

Key Terms

Prealgebra 2eKey Terms

Key Terms

horizontal line
A horizontal line is the graph of an equation that can be written in the form y=by=b. The line passes through the y-axis at (0,b).(0,b).
intercepts of a line
Each of the points at which a line crosses the x-axis and the y-axis is called an intercept of the line.
linear equation
An equation of the form Ax+By=C,Ax+By=C, where AandBAandB are not both zero, is called a linear equation in two variables.
ordered pair
An ordered pair (x,y)(x,y) gives the coordinates of a point in a rectangular coordinate system. The first number is the xx-coordinate. The second number is the yy-coordinate.
(x,y)x-coordinate,y-coordinate(x,y)x-coordinate,y-coordinate
11.1
origin
The point (0,0)(0,0) is called the origin. It is the point where the xx-axis and yy-axis intersect.
quadrants
The xx-axis and yy-axis divide a rectangular coordinate system into four areas, called quadrants.
slope of a line
The slope of a line is m=riserunm=riserun. The rise measures the vertical change and the run measures the horizontal change.
solution to a linear equation in two variables
An ordered pair (x,y)(x,y) is a solution to the linear equation Ax+By=CAx+By=C, if the equation is a true statement when the x- and y-values of the ordered pair are substituted into the equation.
vertical line
A vertical line is the graph of an equation that can be written in the form x=ax=a. The line passes through the x-axis at (a,0).(a,0).
x-axis
The x-axis is the horizontal axis in a rectangular coordinate system.
y-axis
The y-axis is the vertical axis on a rectangular coordinate system.
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