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# Unit 3: Math Vocab

TermDefinition
Constant of proportionality- factor 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- factor 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
Linear equation- an equation between two variables that gives a straight line when plotted on a graph
Point-slope form- useful when we know the y- intercept of a line. However, we are not always given this information. When we know the slope and one point which is not the y -intercept, we can write the equation in point-slope form
Slope-intercept form- the most frequently used way to express equation of a line
Rate of change- a rate of change that describes how one quantity changes in relation to another relation
Slope- is a number that describes both the direction and the steepness of the line
X-intercept- the point at which the line crosses the x axis
Y-axis- the point at which the line crosses the y axis
Unit rate- describes how many units of the first type of quantity corresponds to one unit of the second type of quantity.
Proportional relationship- between the two quantities
Intersecting lines- lines that intersect with one another
Created by: 83MaiSma