Alice has a total of 12 dimes and nickels. she has 2 more nickels than dimes

This is a problem of system of linear equations in two variables. This concept of mathematics is very useful in real-life problems. You can solve a system by finding the solution. A solution of a system are the values of the variables that satisfies each equation in the system. So by knowing these concepts we can get a system of equation by analyzing each statement step by step, that is:

1. Alice has a total of 12 dimes and nickels.

Let the variables:



1st. Equation:



2. She has 2 more nickels than dimes

2nd Equation:



Therefore our system of linear equations is:



Conclusion:

Alice has 5 dimes and 7 nickels. 

Yes, two vertical lines can be complementary