Year 7 Interactive Maths - Second Edition

Equations Involving Subtraction

If we add 4 to both sides of the equation, then we obtain:

We notice that the statement

remains a true statement when 4 is added to both sides of the equation.

This suggests that equations behave like balances.  If the same mass is added to each scale of a balance, it still remains balanced.  This implies that we can add the same number to both sides of an equation to get a new equation.

From the preceding discussion, we can state that:

The same number can be added to both sides of an equation.

Example 4

Solution:

Study Another Topic in Chapter 7: Equations

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