Select the coordinates A′

Question

and B′
after dilation of the line segment AB
with a scale factor of 2, centered at the origin where the endpoints are A(3,7)
and B(4,9)
.

A′(6,14)
and B′(−4,3)
upper A prime left parenthesis 6 comma 14 right parenthesis and upper B prime left parenthesis negative 4 comma 3 right parenthesis

A′(6,14)
and B′(8,18)
upper A prime left parenthesis 6 comma 14 right parenthesis and upper B prime left parenthesis 8 comma 18 right parenthesis

A′(32,72)
and B′(2,92)
upper A prime left parenthesis Start Fraction 3 over 2 End Fraction comma Start Fraction 7 over 2 End Fraction right parenthesis and upper B prime left parenthesis 2 comma Start Fraction 9 over 2 End Fraction right parenthesis

A′(−6,3)
and B′(8,18)

Answer 1

To find the coordinates \( A' \) and \( B' \) after dilation of the line segment \( AB \) with a scale factor of 2, centered at the origin, we can use the following formula for dilation:

\[ (x', y') = (kx, ky) \]

where \( (x, y) \) are the original coordinates, \( (x', y') \) are the new coordinates after dilation, and \( k \) is the scale factor.

Given:

• \( A(3, 7) \)
• \( B(4, 9) \)
• Scale factor \( k = 2 \)

For point \( A \): \[ A' = (2 \cdot 3, 2 \cdot 7) = (6, 14) \]

For point \( B \): \[ B' = (2 \cdot 4, 2 \cdot 9) = (8, 18) \]

Thus, the coordinates after dilation are:

• \( A'(6, 14) \)
• \( B'(8, 18) \)

The correct answer is: A′(6,14) and B′(8,18).