Answer:
I believe it's A) 5x + 6y = 58 8x + 11y = 97
Step-by-step explanation:
Reason is, adult tickets and child tickets are two different things, so they require two different variables, and two different equations because they have two different sums. (This was probably already obvious to you though).
Hope this helps :)
I tried my best to explain.

<em> </em><em>Linear</em><em> </em><em>Pair</em><em> </em>: - <em>Two</em><em> </em><em>adjacent</em><em> </em><em>Angles</em><em> </em><em>are</em><em> </em><em>set</em><em> </em><em>to</em><em> </em><em>form</em><em> </em><em>a</em><em> </em><em>linear</em><em> </em><em>pair</em><em> </em><em>of</em><em> </em><em>angles</em><em> </em><em>if</em><em> </em><em>they</em><em> </em><em>are</em><em> </em><em>not</em><em> </em><em>common</em><em> </em><em>arm</em><em> </em><em>are</em><em> </em><em>two</em><em> </em><em>opposite</em><em>,</em><em> </em><em>is</em><em> </em><em>called</em><em> </em><em>linear</em><em> </em><em>pair</em><em> </em>~™
If the price is p and the quantity of bread sold is q = 400 - 100p, the average collection, in reais, depending on the price p, is given by R (p) = (400 - 100p). P
For this collection to be R $ 300.00, you must have:
(400 - 100p). p = 300 ⇔ 4p - p² = 3 ⇔ p² - 4p + 3 = 0 ⇔ p = 1 or p = 3
R $ 300.00
The current price is R $ 3.00, as R $ 300,000 / 100 = R $ 3
To maintain the collection, the price must be lowered to R $ 1.00 (R $ 0.50 <R $ 1.00 <R $ 1.50)
ANSWER: letter A
Um I need more information for this I don’t really know what you are asking sorry