Solution of simple linear equations

Interpretation with scales

When we have simple scales like the ones shown, in which the arms are of equal length, then they are balanced when the weights are equal.
The equation x+ 3 = 7 can be used to represent the fact that the scales in
the first diagram are balanced.

Detailed description of diagram

Subtract 3 from both sides to show that x = 4 is the solution to the
equation x + 3 = 7.

Detailed description of diagram

Consider another example. In the diagram below, the equation 2x = 6
represents the fact that the scales are balanced.

Detailed description of diagram

Divide both sides by 2 to show that x = 3 is the solution of the equation 2x = 6.

Detailed description of diagram

Equations with one operation

Further examples of solving Simple Linear Equations