Question

I was given the answer but don’t really understand how it got to that answer—please explain!

Answer 1

Given:

The line is reflected across the y-axis.

The triangle is formed that is enclosed by two lines and the x-axis.

The triangle is,

In the above triangle, the base is 6+6=12 units. and heights is 3 unit.

`\begin{gathered} A(\text{triangle)=}(1)/(2)* height* base \\ =(1)/(2)*3*12 \\ =18 \end{gathered}`

Answer: 18 square unit.