Reflection of Points in Coordinate Geometry

Maria Miller from Math Mammoth introduces the coordinate grid, extending it to include negative numbers. She explains how to plot points on the grid, find coordinates, and reflect points across the x and y axes. The lesson concludes with reflecting a triangle across the x-axis, demonstrating how coordinates change during reflection.

What is the main topic introduced in this lesson?

• Fractions and decimals

• Multiplication and division

• Coordinate grid with negative numbers

• Addition and subtraction

What does the x-coordinate represent when plotting a point?

• Horizontal position

• None of the above

• Vertical position

• Diagonal position

If a point is at (3, 4), how many units do you move up on the y-axis?

• 3 units

• 4 units

• 5 units

• 6 units

Where would you plot the point (-4, 1) on the coordinate grid?

• 4 units right, 1 unit down

• 4 units left, 1 unit down

• 4 units left, 1 unit up

• 4 units right, 1 unit up

What is the y-coordinate of the point P if its coordinates are (1, -2)?

• -2

• 1

• -1

• 2

How do you find the coordinates of a point on the grid?

• By using a calculator

• By looking towards the x and y axes

• By measuring with a ruler

• By guessing

What happens to the y-coordinate when a point is reflected across the x-axis?

• It doubles

• It becomes zero

• It remains the same

• It becomes the opposite

When reflecting a point across the y-axis, what happens to the x-coordinate?

• It doubles

• It remains the same

• It becomes zero

• It becomes the opposite

If a point A is at (3, 2) and is reflected across the x-axis, what are its new coordinates?

• (3, 2)

• (-3, 2)

• (3, -2)

• (-3, -2)

What is the result of reflecting a point at (3, 2) across the y-axis?

• (3, -2)

• (-3, 2)

• (-3, -2)

• (3, 2)