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As I understand things, the LaTeX script is cached on your computer, so when you start a post and click Preview Post, the previous LaTeX script, if any, is displayed, not the script you just entered. This is a known problem. The workaround is to refresh the web page. That will display the right LaTeX script.EGill said:Also, this was my first time trying to type a formula into the reply. Whenever I hit preview post it would refresh, but the post would not reflect the changes in the equation area. I had to reload the page to get the post to reflect the changes in equation. Am I doing something wrong. Just trying to learn how to do it without word docs if it is just one equation.
The best way to ensure you are using the correct substitution method is to carefully read through your problem and identify the variable you need to isolate. Then, choose the substitution method that will allow you to eliminate that variable and solve for the remaining one.
One common mistake is forgetting to substitute the entire expression for the variable, including any coefficients. Another mistake is not distributing a negative sign when necessary. It is also important to double check your work after substituting to make sure the resulting equation is correct.
Substitution is best used when one of the equations contains a variable with a coefficient of 1 or -1. It is also useful when one of the equations is already solved for a variable, making it easier to substitute into the other equation.
If you are having trouble solving a problem with substitution, try working through the problem step by step and checking your work after each step. It may also be helpful to review the steps and examples of substitution in your textbook or seek additional help from a teacher or tutor.
No, substitution can only be used to solve systems of equations where one equation can be solved for a variable. It cannot be used to solve equations with more than two variables or equations with no solution.