February 24, 2021

### How To Solve Systems of Equations by the Substitution Method

## 1.

Work out the value of an unknown in one of the equations.

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## 2.

Substitute the expression of this unknown in the other equation, obtaining an equation with one unknown.

## 3.

Solve the equation.

## 4.

The value obtained is substituted into the other equation.

## 5.

The two values obtained are the solution of the system.

Q. Find the value of unknowns using the substitutional method.

## 1

Work out the value of x.

## 2

Substitute into the other equation the value of x:

## 3

Solve the equation obtained:

## 4

Substitute the value obtained.

## 5

Solution:

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