21 terms

rate of change

shows the relationship between two changing quantities.

slope

the ratio of the vertical change to the horizontil change

direct variation

a linear function defined by an eqution of the form y=kx , where k = o

linear equation

an equation whose graph forms a straight line

y - intercept

the y-coordinate of a point where a graph crosses the y-axis

slope-intercept form

the slope-intercept form of a linear equation is y = mx + b, where m is the slope of the line and b is the y-intercept

point-slope form

a linear equation of a nonvertical line written as y - y = m(x-x). the line passes through the point (x-x) with slope m.

x-intercept

the x-coordinate of a point where a graph crosses the x-axis

stanard form of a linear equation

the standard form of a linear equation is ax + by = c , where a,b, and c are real numbers and a and b are not both zero

parallel lines

two lines in the same plane that never intersect. parallel lines have the same slope.

opposite reciprocals

a number of the form ba ,where ab is a nonzero rational number. the product of a number and its opposite reciprocals is -1

scatter plot

a graph that relates two different sets of data by displaying them as ordered pairs

positive correlation

the relationship between two sets of data in which both sets of data increses together

negative correlation

the relationship between two sets of data , in wich one set of data decreses as the other set of data increases.

no correlation

there does not appear to be a relationship between two sets of data

trend line

a line on a scatter plot drawn near the points. it shows a correlation.

interpolation

the process of estimating a value between two known quantities

extrapolation

the process of predicting a value outside the range of known values

line of best fits

the most accurate trend line on a scatter plot showing the relationship between two sets of data

absolute value function

a function with a v-shape graph that opens up or down. the parent function for the family of absolute value function is y = /x/.

perpendicular lines

lines that intersect to form right angles. two lines are perpendicular if the product of their slopes is -1