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# Unit 3

### Linear Relationships

TermDefinition
direct variation a relationship between two variables in which one is a constant multiple of the other; a proportional relationship where y=kx
function a relationship in which each input (x) has exactly one output (y)
linear relationship a relationship that can be represented with a straight line that has a constant rate of change or slope
proportional a relationship with a constant ratio, that when graphed passes through the origin and forms a straight line
slope rate of change; the ratio of the change in y-values over the change in x-values, or "rise" over "run", the steepness of a line
slope-intercept form the equation of a straight line in the form of y=mx + b where m is the slope and b is the y-intercept
y-intercept the point where a line crosses the y-axis; the y-value when x is zero
rate of change the rate at which one quantity changes relative to the change in the input quantity
system of equations a collection of two or more equations with the same set of unknowns
constant of proportionality s special relationship between two variables; where when one changes, the other changes as well
run horizontal distance a line goes across for a specified distance going up
rise vertical distance a line goes u or down for a specified distance going across
undefined a word used when an expression in mathematics has no meaning
Created by: krempinm
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