Math 7 Warm-Up 1-2

Front

What is the result of rotating a point (x, y) 180° about the origin?

Back

The new coordinates will be (-x, -y).

Front

What does it mean to reflect a shape in the y-axis?

Back

The x-coordinates of the points of the shape change sign, while the y-coordinates remain the same.

Front

What is a dilation in geometry?

Back

A transformation that alters the size of a shape, either enlarging or reducing it.

Front

Calculate -8 + 20.

Back

12

Front

If Bob lost 5 points on page one and 9 points on page two, what is the equation representing his total loss?

Back

-5 + -9 = -14

Front

What are the coordinates of point A' if point A is at (3, 5) after a 180° rotation about the origin?

Back

(-3, -5)

Front

What happens to the coordinates of a point when it is reflected over the x-axis?

Back

The y-coordinates change sign, while the x-coordinates remain the same.

Front

What is the formula for calculating the total change in points if a student loses points on multiple pages?

Back

Total change = Sum of all point losses.

Front

What is the difference between an enlargement and a reduction in dilation?

Back

An enlargement increases the size of a shape, while a reduction decreases it.

Front

If a shape is dilated by a scale factor of 2, what happens to its dimensions?

Back

All dimensions are multiplied by 2.