# How do you solve equations by substitution?

## How do you solve equations 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 is substitution method with example?

The first step in the substitution method is to find the value of any one of the variables from one equation in terms of the other variable. For example, if there are two equations x+y=7 and x-y=8, then from the first equation we can find that x=7-y. This is the first step of applying the substitution method.

How do you do addition method?

How To: Given a system of equations, solve using the addition method.

1. Write both equations with x– and y-variables on the left side of the equal sign and constants on the right.
2. Write one equation above the other, lining up corresponding variables.
3. Solve the resulting equation for the remaining variable.

### What is substitution example?

An example of substitution: ‘I bet you get married [A] before I get married [A]. ‘ – repetition. ‘I bet you get married [A] before I do [B].

### What is substitution math example?

For example, if there are two equations x+y=7 and x-y=8, then from the first equation we can find that x=7-y. This is the first step of applying the substitution method.

What is substitute math?

Substitution is the name given to the process of swapping an algebraic letter for its value. Consider the expression 8 + 4. This can take on a range of values depending on what number actually is. If we are told = 5, we can work out the value of the expression by swapping the for the number 5.

#### How do you solve two equations using substitution?

To solve systems using substitution, follow this procedure:

1. Select one equation and solve it for one of its variables.
2. In the other equation, substitute for the variable just solved.
3. Solve the new equation.
4. Substitute the value found into any equation involving both variables and solve for the other variable.

#### What is substitution in math in algebra?

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