Reflecting a point in the x-axis

Difficulty Stretch · Set 8hm9l3

Give each new point as x, y.

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

1
Reflect (15, 11) in the x-axis.
2
Reflect (-22, -5) in the x-axis.
3
Reflect (-28, 10) in the x-axis.
4
Reflect (6, -17) in the x-axis.
5
Reflect (-23, 18) in the x-axis.
6
Reflect (4, 28) in the x-axis.
7
Reflect (-6, -20) in the x-axis.
8
Reflect (-2, 6) in the x-axis.
9
Reflect (4, -3) in the x-axis.
10
Reflect (-1, 6) in the x-axis.
11
Reflect (12, 29) in the x-axis.
12
Reflect (-30, -22) in the x-axis.
13
Reflect (9, -23) in the x-axis.
14
Reflect (-19, -15) in the x-axis.
15
Reflect (-16, 20) in the x-axis.
16
Reflect (6, 10) in the x-axis.
17
Reflect (-7, 12) in the x-axis.
18
Reflect (-22, 15) in the x-axis.
19
Reflect (5, -17) in the x-axis.
20
Reflect (-23, -9) in the x-axis.

What is in this set

The numbers in this set run from 1 to 30.
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 236 different ones, 98% — 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.