Question

I need help with the equation inserted in the picture.

Answer 1

x = 4

-4x+21 => 5

Explanation:

The given triangle in the picture is isosceles triangle which means that two sides of the triangle are equal.

So,

`Side\ 1: -4x+21\\Side\ 2: -4x+21\\Side\ 3: 6\\Perimeter = 16`

Now

Putting all the values in equation for perimeter

`Side\ 1+Side\ 2+Side\ 3 = 16\\-4x+21 -4x+21 + 6 =16\\-8x +48 = 16\\-8x = 16-48\\-8x = -32\\(-8x)/(-8) = (-32)/(-8)\\x = 4`

Putting x = 4 in side 1

`=-4(4)+21\\= -16+21\\=5`

Hence,

x = 4

-4x+21 => 5