### 2) The equation of the line of symmetry

To describe a reflection on a grid, the equation of the mirror line is needed.

Reflect the shape in the line .

The line is a vertical line which passes through -1 on the *x*-axis.

##### Question 1

Describe the transformation of the shape ABC.

**Answer**: The line is a horizontal line which passes through 1 on the x-axis. The shape has been reflected in the line .

##### Question 2

Reflect the shape in the line .

**Answer**: The equation of a straight line graph has the form of , where *m* is the gradient and *c* is where the line crosses the *y*-axis.

The line has a gradient of 1 and crosses the *y*-axis at (0,0).

##### Question 3

Describe the transformation of the shape ABC.

The mirror line has a gradient of -1 and crosses the *y*-axis at (0,0). The shape has been reflected in the line .