Answer:
30 adult's tickets were sold and 7 children's ticket were sold.
Explanation:
We are given the following information in the question:
Cost of Adult's tickets = $8
Cost of Children's ticket = $5
Total money collected = $275
Let x be the number of adult's tickets sold and y be the number of children's ticket sold.
Then, we can write this in the form of equation:
![8x + 5y =275](https://img.qammunity.org/2020/formulas/mathematics/high-school/ll4twsnd0scv9gl97oaw3rdqu3vpqhg5fn.png)
The point (30,7) means that 30 adults ticket were sold and 7 children's ticket were sold.
Putting these value in the equation:
![8x + 5y =275\\8* 30 + 5* 7 =240 + 35 = 275](https://img.qammunity.org/2020/formulas/mathematics/high-school/gfq0sl4451ci58a29f20cnnef3m5k92lt8.png)
which is true.
Thus, 30 adult's tickets were sold and 7 children's ticket were sold.