If RT=36, find the value of x

4

Step-by-step explanation:

So we know that RT is 36.

Note that RT is the combined length of RS and ST. Therefore:

Substitute. RT is 36, RS is 6x+1 and ST is x+7:

Combine like terms and add:

Subtract 8 from both sides:

Divide by 7:

So, our answer is 4 :)