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# Unit 3 Vocab.

TermDefinition
Slope of a straight line shows how steep a straight line is.
x-intercept The value of x when a given curve crosses the x-axis
y-intercept The value of y when a given curve crosses the y-axis.
Unit Rate is the ratio of two measurements in which the second term is 1.
Constant of Proportionality the 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 A relationship between two variables such that the values of both variables increase or decrease together at a constant rate.
Linear Equation An equation in which the highest power of any variable is one.
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 form coordinate system, the equation of a straight line in the form y = mx + b, where m is the slope of the line and b is its intercept on the y axis.
Rate of Change
Proportional relationship
Intersecting Lines
Created by: TaJiane45