Evaluating an Algebraic Expression With Two Operations

In this lesson, we learn ways lto evaluate algebraic expressions that involve two operations.

Evaluate the algebraic expression x + 3y; for x = 2, y = 3

Solution

Step 1:

Replacing x with 2 and y with 3

x + 3y = 2 + (3 × 3) = 2 + 9 = 11

Step 2:

So, for x = 2, y = 3, x + 3y = 11

Evaluate the algebraic expression a − $\frac{b}{3}$; for a = 5, b = 12

Solution

Step 1:

Replacing a with 5 and b with 12

a − $\frac{b}{3}$ = 5 − $\frac{12}{3}$ = 5 − 4 = 1

Step 2:

So, for a = 5, b = 12, a − $\frac{b}{3}$ = 1