A variable is a letter such as $x$ that stands for an unknown number. An expression is something like $3 x + 5$ , while an equation says two expressions are equal, like $3 x + 5 = 20$ .

When a question gives a shape, a total, or an angle fact, first write an expression from the information. Then form an equation by setting that expression equal to the known value.

To solve the equation, use inverse operations and do the same thing to both sides. Finally, check that your answer fits the original situation.

The lengths, in cm, of the sides of a triangle are $3 x - 5$ , $2 x - 1$ and $x + 1$

Like terms have the same [ ], such as $2 x$ and $5 x$ .

Practise questions

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Two angles on a straight line are $5 x + 10$ degrees and $3 x + 2$ degrees. Find $x$ .

A variable is a letter such as $x$ that stands for an unknown number. An expression is something like $3 x + 5$ , while an equation says two expressions are equal, like $3 x + 5 = 20$ .

When a question gives a shape, a total, or an angle fact, first write an expression from the information. Then form an equation by setting that expression equal to the known value.

To solve the equation, use inverse operations and do the same thing to both sides. Finally, check that your answer fits the original situation.

The lengths, in cm, of the sides of a triangle are $3 x - 5$ , $2 x - 1$ and $x + 1$

Like terms have the same [ ], such as $2 x$ and $5 x$ .

Two angles on a straight line are $5 x + 10$ degrees and $3 x + 2$ degrees. Find $x$ .

Forming and Solving Equations

Review Forming and Solving Equations by teaching Genie

Recap your knowledge with an interactive lesson

Put it into practice with exam-style questions

Remember key concepts with flashcards

Forming and Solving Equations

Practise questions

Review Forming and Solving Equations by teaching Genie

Recap your knowledge with an interactive lesson

Put it into practice with exam-style questions

Remember key concepts with flashcards

Practise questions

Forming and Solving Equations

Review Forming and Solving Equations by teaching Genie

Recap your knowledge with an interactive lesson

Put it into practice with exam-style questions

Remember key concepts with flashcards

Forming and Solving Equations Revision Guide

Forming and Solving Equations

Practise questions

Review Forming and Solving Equations by teaching Genie

Recap your knowledge with an interactive lesson

Put it into practice with exam-style questions

Remember key concepts with flashcards

Forming and Solving Equations Revision Guide

Practise questions