Hi Mike

For question 13 test 1 no calculator, I used plugging in. I made x = 4 and solved to get 42/13. then I plugged 4 into my answer choices and B gave me 42/13.

I am curious as to why you did not use plug in for your answer and explanation.

(Link to the referenced solution.)

Good question. I definitely have this one categorized as plug-innable in my book, but because there’s *some* algebraic manipulation required whether you plug in or not, I guess I chose to take it as an opportunity to push that skill. Your solution (elaborated below) is also totally valid, and would *definitely *be my preferred method on a section where calculators were allowed.

Now set in each answer choice to see which one simplifies to :

A)

[highlight style=”yellow”]B) [/highlight]

C)

D)