Exercise 1 Page 110

Every equation has an equal sign and values or expressions on either side of it. Key phrases such as is, is equal to, and equals tell us about the placement of the equal sign. The sum of three timesaand four = five timesa On the left-hand side, we have two keywords: sum and times. These words tell us the operations that will be used in our equation. Sum indicates addition, while times indicates multiplication.

The sum of three timesa and four 3a + 4 On the right-hand side, the keyword is times. Once again, it tells us to multiply. five timesa 5a Putting these sides together, we have a complete equation. 3a + 4 = 5a