How do you solve systems of equations?

How to solve a system of equations by elimination.

  1. Write both equations in standard form.
  2. Make the coefficients of one variable opposites.
  3. Add the equations resulting from Step 2 to eliminate one variable.
  4. Solve for the remaining variable.
  5. Substitute the solution from Step 4 into one of the original equations.

How do you solve a 3 way system?

Pick any two pairs of equations from the system. Eliminate the same variable from each pair using the Addition/Subtraction method. Solve the system of the two new equations using the Addition/Subtraction method. Substitute the solution back into one of the original equations and solve for the third variable.

How do you solve systems of inequalities?

  1. Step 1: Solve the inequality for y.
  2. Step 2: Graph the boundary line for the inequality.
  3. Step 3: Shade the region that satisfies the inequality.
  4. Step 4: Solve the second inequality for y.
  5. Step 5: Graph the boundary line for the second inequality.
  6. Step 6: Shade the region that satisfies the second inequality.

How do you solve systems by substitution?

Solve a system of equations by substitution

  1. Solve one of the equations for either variable.
  2. Substitute the expression from Step 1 into the other equation.
  3. Solve the resulting equation.
  4. Substitute the solution in Step 3 into one of the original equations to find the other variable.
  5. Write the solution as an ordered pair.

What are the 4 ways to solve a system?

There are a few different methods of solving systems of linear equations:

  1. The Graphing Method .
  2. The Substitution Method .
  3. The Linear Combination Method , aka The Addition Method , aka The Elimination Method.
  4. The Matrix Method .

How do you solve linear systems with 3 variables?

A system of three equations in three variables can be solved by using a series of steps that forces a variable to be eliminated. The steps include interchanging the order of equations, multiplying both sides of an equation by a nonzero constant, and adding a nonzero multiple of one equation to another equation.

What are systems of equations and inequalities?

A system of equations is a set of equations with the same variables. A system of inequalities is almost exactly the same, except you’re working with inequalities instead of equations! To solve such a system, you need to find the variable values that will make each inequality true at the same time.

How do you do substitution step by step?

The method of substitution involves three steps:

  1. Solve one equation for one of the variables.
  2. Substitute (plug-in) this expression into the other equation and solve.
  3. Resubstitute the value into the original equation to find the corresponding variable.