Question

Ryan wants to describe the translation shown on the grid below.

On a coordinate plane, triangle X Y Z is shifted 1 unit to the left and 3 units up to form triangle X prime Y prime Z prime.

Ryan uses the following steps to describe the translation.

Step 1 Identify the pre-image and the image:
The pre-image is triangle XYZ, and the image is X prime Y prime Z prime.

Step 2
Identify the number of units that each point moves horizontally:
Each point moves one unit left.

Step 3
Identify the number of units that each point moves vertically:
Each point moves three units down.

Step 4
The translation is one unit left and three units down.

In which step did Ryan make the first error?
Step 1
Step 2
Step 3
Step 4

Answer 1

Step 3.

The given translation is 1 unit left and 3 units up, so the vertical move is up, not down. (Step 4 would also be wrong as a consequence, but the first mistake appears in Step 3.)