Question

Someone please help me with this.

Answer 1

17

Explanation:

What we have to realize is that RS + ST = RT. Since we know the value of all, let's substitute inside the equation.

`23 - 2x + 9x - 5 = 39`

Now let's try and solve for x by isolating the variable on one side.

Combine like terms:

`7x + 18 = 39`

Subtract 18 from both sides:

`7x = 21`

Divide both sides by 7:

`x = 3`

Now that we know the value of x, we can substitute it back into the equation for RS,
`23-2x`.

`23-2(3)\\\\23-6\\17`

Hope this helped!