Lesson 5: Represent Rational Numbers on the Coordinate Plane6.NOS.6

I can…

I can plot and identify points on the coordinate plane using ordered pairs.

Key words

• Graph on the Coordinate Plane — Mark a point: go across first, then up or down.
• Coordinate plane — A flat grid for placing points with two numbers.
• Ordered pair — Two numbers (x, y) that tell where a point is.
• Origin — The point (0, 0), where the two number lines cross.
• Quadrant — One of the four parts of a coordinate grid.
• Reflection — A flip of a shape across a line.
• Integer — A whole number or its opposite, like 2 and −2.
• x-coordinate — The first number in a pair. It tells left or right.
• x-axis — The number line that goes left to right.
• y-axis — The number line that goes up and down.

Steps

1. I will plot the point (5, 4). The 5 is the x-coordinate, and the 4 is the y-coordinate.
2. I start at the origin, which is (0, 0).
3. First I move 5 units to the right along the x-axis.
4. Then I move 4 units up. I place my dot. That is the point (5, 4).

Try it

Point Q is located 4 units right and 7 units up from the origin. What ordered pair names point Q?

Check your answer

(4, 7)

Right 4 = x-coordinate of 4, Up 7 = y-coordinate of 7. The ordered pair is (4, 7).

Sentence starter

I know ___ because ___.

Goal: I can explain my work using the words coordinate plane, ordered pair, origin, and quadrant.