Question

A student reflected four points across the y-axis and recorded his work as sets of ordered pairs. Which set of ordered pairs has an error?

Original point Reflection across the y-axis
A (6, 8) (-6, 8)
B (1, 1) (-1, 1)
C (0, 3) (0, 3)
D (3, 2) (3, -2)
Set A
Set B
Set C
Set D

Answer 1

The set D has an error.

Step-by-step explanation:

Step 1:

Given set of ordered pairs

A (6, 8) (-6, 8)

B (1, 1) (-1, 1)

C (0, 3) (0, 3)

D (3, 2) (3, -2)

We need to find the set which has an error of incorrect reflection across the y axis.

Step 2 :

When a point is reflected across the y - axis , the value of y in the point (x,y) will be the same, and the sign of the  x value will be changed to its opposite

i.e if we have a point (x,y) reflection across y axis will be (-x,y)

Step 3 :

Point A - y is same , sign of x is changed to opposite.

Point B - y is same , sign of x is changed to opposite.

Point C - y is same , x is 0

Point D - y is not same , sign of x is not changed to opposite.

Hence the set D has an error.

Step 4 :

Answer :

The set D has an error.