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# 1st algebra vocab!

### 12/10/10

slope the slope m of a nonvertical line is the ratio of the vertical change (rise) to the horizontal change (run) between any two points (x1,y1) y y1y2) on the line
run the horizontal change in a line
rise the vertical change in a line
point-slope form an equation of a nonvertical line written in the form y-y1=m(x-x1) and has a slope of m
standard form ax+by=c, where a, b and c are real numbers and a and b are not both zero.
x-intercept the x-coordinate of a point where a graph crosses the x-axis
y-intercept the y-coordinate of a point where a graph crosses the y-axis
slope-intercept form a linear equation written in the form y=mx+b where m is the slope and b is the y intercept of the equation's graph
family of functions a group of functions with similar characteristics
parent linear functions the function f(x)=x
parallel lines two lines in the same plane that don't intersect
perpendicular lines two lines in the same plane that intersect to form a right angle
direct variation the relationship of two variables x and y if there is a nonzero number a such that y=ax. if y=ax, then y is said to vary directly with x.
inverse variation the relationship of two variables a and y is there is a nonzero number a such that y=a/x. if y+a/x,
best-fit line the line that most closely follows a trend in data , found using technology
negative correlation
positive correlation
regression line the most accurate best-fit line for a set of data, and can be determined with a graphing calculator
scatter plot a graph used to determine whether there is a relationship or trend between paired data
Created by: 100000097858545