Elementary Algebra Quiz 4

1. A rectangular coordinate system consists of two perpendicular number lines. One number line is drawn horizontally and the other is drawn vertically.

2. Each point in a coordinate plane can be identified by a pair of real numbers x and y written in the form (x, y).

The first number is called the x-coordinate and represents a number on the horizontal number line.

The second number is called the y-coordinate and represents a number on the vertical number line.

3. The process of locating a point in the coordinate plane is called graphing or plotting the point.

4. To determine the coordinate of a point in the coordinate plane:

Construct a vertical line through the point. It will intersect the x-axis at some number k.

This number k is the x-coordinate of the point.

Construct a horizontal line through the point. It will intersect the y-axis at some number t.

The number t is the y-coordinate of the point.

The coordinates of the point are (k, t).

5. Is 5 a solution of 2b + 3 = 15 ?

NO. Because 2(5) + 3 = 13 ¹ 15

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Thank You