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BECE Mathematics 2017 Paper

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Question : 25

Total: 40

The point

D(4,3)

is reflected in the

y

-axis. Find the coordinates of its image.

$(-4,-3)$
$(-3,4)$
$(-4,3)$
$(3,-4)$

Solution:

Concept:

Reflection in the

y

-axis changes the sign of the

x

-coordinate only.

Explanation:

For reflection in the

y

-axis, the image of

(x, y)

is

(-x, y)

.

The given point is

D(4,3)

, so

x = 4

and

y = 3

.

Apply the rule:

D(4,3) \rightarrow (-4,3)

.

The

y

-coordinate remains

3

, while the

x

-coordinate becomes

-4

.

Answer:

C.

(-4,3)

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