We do not do your homework for you because that would be cheating.
Solving inequalities and equations are the same because both have variables in the equation.
Solving the equation.
The main goal is to find a set of values for the variables for which all the equations are true.
It is about finding a value of the variable (or variables) that make the equation a true statement.
There are too many to list. In algebra, there is factoring, graphing, solving equations of 1 variable, solving equations of 2 variables, all operations with variables (addition, subtraction, mult, div, exponentials, etc) and more. And that is just algebra.
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The first step is to solve one of the equations for one of the variables. This is then substituted into the other equation or equations.
Standard form for equations of two variables is preferred when solving the system using elimination.
you need 2 equations to solve for 2 variables
b=.20[100,000-.40(100,000-b)]
y = 10
Calculators won't read variables, so you have to put in the number it is equal to yourself.