Exercise 1 Page 94

Inverse operations are pairs of operations that undo each other. For example, subtraction is the inverse operation of addition. When we add a number and subtract the same number, they cancel each other out. x + 2 - 2 = x + 2 - 2 = x Division is the inverse operation of multiplication because they undo each other. y * 3 ÷ 3 = yIn equations with variables on both sides, we want to gather variable terms on one side of the equation and numbers on the other side. Let's solve an example equation. We will start by combining like terms.

After we simplify, we use inverse operations to cancel out some terms. On the left-hand side of the equation we will only keep the x-terms and on the right-side of the equation we will only keep the numbers. x-terms=numbers This means that we want to cancel out x on the right-hand side. Let's use inverse operations to do that!

The term disappears on one side of the equation and appears on the other side with the opposite sign. Remember that it is important to apply inverse operations on both sides of the equation! Only then we get an equivalent equation — an equation with the same solutions. Following the same way of thinking, we can solve the equation completely.

In summary, inverse operations allow us to move terms from one side of the equation to the other. This process does not change the solutions of the equation.