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# unit 3 vocabulary

TermDefinition
constants of proportionality he constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality
direct variation two variables that can be expressed by an equation in which one variable is equal to a constant times the other
linear equation an equation of the first degree in any number of variables
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 in a Cartesian coordinate system.
slope-intercept 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 a value that results from dividing the change in a function of a variable by the change in the variable <velocity is the rate of change in distance with respect to time>
slope the tangent of the angle between the line and another line parallel to the x-axis
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 a price or charge with reference to a standard or scale
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 The notion of line or straight line was introduced by ancient mathematicians to represent straight objects with negligible width and depth. Lines are an idealization of such objects
Created by: 62malpri

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