Example 10 - Chapter 4 Class 7 - Expressions using Letter-Numbers (Ganita Prakash)

Transcript

Example 10 Are the expressions 5u and 5 + u equal to each other? Are the expressions 10y – 3 and 10(y – 3) equal? Checking expressions 5u and 5 + u Let’s check values of each using different values of u Thus, we note that the two expressions are not equal for different values of u. So, these two expressions are not equal. Checking expressions 10y – 3 and 10(y – 3) Now, 10(y – 3) = 10y – 30 Let’s check values of each using different values of y Thus, we note that the two expressions are not equal for different values of y. So, these two expressions are not equal.