Question

Someone please help me with this.

Answer 1

Answer:

17

Step-by-step 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!