- an equation whose solution falls on a line on the coordinate plane
- linear equation
- amount of vertical change (difference in the y-values)
- rise
- amount of horizontal change (difference in x-values)
- run
- ratio of rise to run
- slope
- slope = 0
- horizontal line
- where the line crosses the x-axis
- x-intercept
- slope = undefined
- vertical line
- where the line crosses the y-axis
- y-intercept
- y = mx + b
- slope-intercept form
- How many points do you need to graph a line?
- two
- point slope form
- y-y1=m(x-x1)
- A line which is flat--having no vertical change from left to right.
- no slope
- Two coordinates used to graph a point on a coordinate plane. Written as (x,y)
- ordered pair
- standard form of a linear equation
- ax + by =c
- one of four regions created by the x-axis and y-axis in a coordinate plane
- quadrant
- the point (0,0) where the x-axis and y-axis intersect on the coordinate plane
- origin
- a plane formed by the intersection of the x-axis and y-axis
- coordinate plane
- the y-coordinates tend to decrease as the x-coordinates increase
- negative correlation
- the y-coordinates tend to increase as the x-coordinates decrease
- positive correlation
- Two lines that do not intersect. The slope of parallel lines are the same.
- parallel lines
- Two lines that intersect at a right angle. The slopes of perpendicular lines are opposite reciprocals of each other.
- perpendicular lines

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