Concepts

• A proportion is a statement that two ratios are equal. It can be written in two ways: as two equal fractions $\frac{\mathrm{a}}{\mathrm{b}}\mathrm{ = }\frac{\mathrm{c}}{\mathrm{d}}$; or using a colon, a:b = c:d.
• Coordinate Plane – a type of grid that is formed when two number lines (x and y) intersect at their zero points.
• An ordered pair contains the coordinates of one point in the coordinate system.
• A point is named by its ordered pair of the form of (x, y). The first number corresponds to the x-coordinate and the second to the y-coordinate.
• x-coordinate – corresponds to a number on the horizontal x-axis.
• y-coordinate - corresponds to a number on the vertical y-axis.
• Rate – A ratio that compares two quantities with different kinds of units.

Rules

A point is named by its ordered pair of the form of (x, y). The first number corresponds to the x-coordinate and the second to the y-coordinate.

x-coordinate – corresponds to a number on the horizontal x-axis.
y-coordinate - corresponds to a number on the vertical y-axis.

Example

Choose the correct ordered pair for point W.

Solution

1. A point is named by its ordered pair of the form of (x, y). The first number corresponds to the x-coordinate and the second to the y-coordinate.

   1. The number on the x-axis under W is 1.
   2. The number on the y-axis across from W is 5.

Answer: the ordered pair for W is (1,5)

Pre-requisite Skills

Coordinate Graphing (4.11.1)

Coordinate Graphing (4.11.2)