1. Suppose there is a family with two children, one brother and one sister. They go to buy candy. My brother bought 10 candy, and my sister bought 8 candy. When they got home, they mixed the sweets together and found that the total number of sweets was 20. Now we need to find out how many sweets my brother and sister bought respectively.
We can assume that my brother buys X candy and my sister buys Y candy. According to the topic information, we can get an equation: x+y = 20. Then according to the information in the title, we know that my brother bought 10 candy, so we can get the second equation: x = 10. Now we have two equations: x+y = 20 and x = 10.
3. The value of y can be obtained from these two equations. Substituting the second equation into the first equation, we get: 10+y = 20, and the solution is y = 10. So, we got the answer: my brother bought 10 candy, and my sister bought 10 candy. This example shows how to solve practical problems by using binary linear equations.
The benefits of learning mathematics
1, learning mathematics is helpful to improve our logical thinking and reasoning ability. Mathematics is a rigorous science, and every conclusion needs rigorous reasoning and proof. In the process of learning mathematics, we need to constantly exercise our logical thinking and reasoning ability to understand and prove various conclusions in mathematics.
Mathematics plays a key role in scientific research and engineering. No matter physics, chemistry, biology or economics, it is necessary to use mathematics to analyze data and establish models. By studying mathematics, we can better understand and apply the knowledge of these subjects, so as to better solve practical problems and conduct scientific research.
3. Mathematics is also widely used in finance, statistics, computer and other fields. These fields need to deal with a lot of data and information, and various methods and skills in mathematics can help us to better process and analyze these data. For example, mathematical knowledge such as probability statistics, linear algebra and calculus is widely used in the financial field.