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# Unit 3 Vocabulary

TermDefinition
Constant of proportionality the constant value of the ratio of two proportional quantities x and y
Direct variation a relationship between two variables that is expressed by an equation where one variable is equal to a constant times another.
Linear Equation a equation where each term is a constant or the product of a constant.
Point-slope form the equation of a straight line in the form y − y1 = m(x − x1) where m is the slope of the line and (x1, y1) are the coordinates of a given point on the line
Slope-intercept form the equation of a straight line in the form y = mx + b where m is the slope of the line and b is its y-intercept
Rate of Change The speed at which a variable changes over a specific period of time.
Slope The steepness of a line
x-intercept the x-coordinate of a point where a line, curve, or surface intersects the x-axis
y-intercept the y-coordinate of a point where a line, curve, or surface intersects the y-axis
unit rate the ratio of two measurements in which the second term is 1.
Proportional relationship Two quantities are proportional if they vary in such a way that one of them is a constant multiple of the other.
Intersecting Lines Lines that have one and only one point in common are known as intersecting lines.
Created by: miamiheat305786