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# Unit Four

### Graphs & Two-Variable Equations

TermDefinition
coefficient a number that is multiplied by a variable(s)
constant a fixed value that does not appear with a variable(s)
constant of proportionality a constant ratio between two proportional quantities denoted by the symbol k
constant rate of change a ratio when the dependent, y-value, changes at a constant rate for each independent, x-value
Linear relationship a relationship with a constant rate of change represented by a graph that forms a straight line
Rational numbers the set of numbers that can be expressed as a fraction , where a and b are integers and b ≠ 0. The set of rational numbers is denoted by the symbol Q.
Rise how many units you move up or down from point to point.
Run how far left or right you move from point to point.
Slope intercept form In the equation of a straight line (when the equation is written as "y = mx + b"), the slope is the number "m" that is multiplied on the x, and "b" is the y-intercept (that is, the point where the line crosses the vertical y-axis).
origin The starting point. On a two-dimensional graph it is where the X axis and Y axis cross.

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