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In the same wasy as you solve equations except that if you multiply or divide both sides by a negative number, then the inequality changes direction.
You can solve the system of equations with three variables using the substitute method, or using matrix operations.
Solve for variables using equations graphs and tables. There is also a lot of substituting
isolate
Lety be the column vector the dependent variable,M be the matrix of coefficients, andx be the column vector of variablesso that the system of equations may be represented by y = Mx.Then the solution set is obtained by left-multiplying both sides by M^-1that is x = M^-1*y