Exercise 5 Page 190

In an ( x, y) ordered pair, the first number tells us the x-coordinate of the point and the second number tells us the y-coordinate of the point. To graph ( 2, 8), we first find 2 on the x-axis and make a mental note of this grid line. The x-coordinate 2 tells us to move 2 units to the right of the origin — the positive horizontal direction.

Next, we find 8 on the y-axis and follow this grid line until it collides with the grid line from our x-coordinate. The y-coordinate 8 tells us to move 8 units up from the origin — the positive vertical direction.

The point ( 2, 8) lies on the point at which these two grid lines intersect.