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# mhill ch 2

### 7th math

TermDefinition
complex fraction a fraction A/B where A or B are fractions and b does not equal zero.
constant of proportionality a constant ratio or unit rate of two variable quantities. It is also called the constant of variation.
constant of variation the constant ratio in a direct variation. It is also called the constant of proportionality.
constant rate of change the rate of change in a linear relationship.
coordinate plane a plane in which a horizontal number line and a vertical number line intersect at their zero points. Also called a coordinate grid.
cross products the product of the numerator of one ratio and the denominator of the other ratio. The cross products of any proportion are equal.
dimensional analysis the process of including units of measurement when you compute.
direct variation the relationship between two variable quantities that have a constant ratio.
equivalent ratios two ratios that have the same value.
nonproportional the relationship between two ratios with a rate of ratio that is not constant.
ordered pair a pair of numbers used to locate a point in the coordinate plane An ordered pair is always written in the form/order (x-coordinate, y-coordinate)
origin the point at which the x-axis and the y-axis intersect in a coordinate plane. The origin is at (0,0)
proportion an equation stating that two ratios or rates are equivalent
proportional the relationship between two ratios with a constant rate or ratio
quadrants one of the four regions into which the two perpendicular number lines of the coordinate plane separate the plane.
rate a ratio that compares two quantities with different kinds of units
rate of change a rate that describes how one quantity changes in relation to another. A rate of change is usually expressed as a unit rate.
unit rate a rate that is simplified so that it has a denominator of 1 unit.
unit ratio a unit rate where the denominator is one unit.
x-axis the horizontal number line in a coordinate plane
x-coordinate the first number of an ordered pair. It corresponds to a number on the x-axis.
y-axis the vertical number line in a coordinate plane.
y-coordinate the second number of an ordered pair. It corresponds to a number on the y-axis