If the x-axis is the reflecting line a is (-1,2) its reflection image is a=

 The required co-ordinates of the image are A'(-1, -2).

Step-by-step explanation:  We are given to find the image of the point A(-1, 2) if X-axis is the reflecting line.

We know that

if a point (x, y) is reflected across the X-axis, then its y co-ordinates changes sign.

That is, the co-ordinates changes according to the following rule :

(x, y)   ⇒   (x, -y)

So, if we reflect the point A(-1, 2) across the X-axis, then its co-ordinate becomes :

A(-1, 2)   ⇒   A'(-1, -2).

Thus, the required co-ordinates of the image are A'(-1, -2).

i think the length is 12 and the width is 17