Reflecting a point in the x-axis

Difficulty Standard · Set 4apruz

Give each new point as x, y.

Fill in what you can and press Check. Nothing you type is sent anywhere.

1
Reflect (2, 3) in the x-axis.
2
Reflect (1, -12) in the x-axis.
3
Reflect (-1, -5) in the x-axis.
4
Reflect (7, -12) in the x-axis.
5
Reflect (-2, 11) in the x-axis.
6
Reflect (7, 8) in the x-axis.
7
Reflect (6, 8) in the x-axis.
8
Reflect (-9, 9) in the x-axis.
9
Reflect (-8, 4) in the x-axis.
10
Reflect (9, 8) in the x-axis.
11
Reflect (7, 9) in the x-axis.
12
Reflect (3, 2) in the x-axis.
13
Reflect (12, -4) in the x-axis.
14
Reflect (3, -9) in the x-axis.
15
Reflect (-4, -1) in the x-axis.
16
Reflect (5, -3) in the x-axis.
17
Reflect (-5, 8) in the x-axis.
18
Reflect (-5, -1) in the x-axis.
19
Reflect (5, 10) in the x-axis.
20
Reflect (-12, -2) in the x-axis.

What is in this set

The numbers in this set run from 1 to 12.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: a reflection in the x-axis leaves the x coordinate alone and changes the sign of the other one.
Answers are a short answer exactly as the problem asks for it.

Drawing 240 problems from this page produced 193 different ones, 80% — so a sheet of 20 is a new sheet almost every time.

The same skill, harder or easier

We would put this in front of a grade 6 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.