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Two Variable Expressions

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Two Variable Expressions

Substitute each variable with its given value, then follow the order of operations. For word problems, write an expression before finding its value.

Evaluate the expressions

Show your calculations.

1.Find the value of 4x + 3y when x = 2 and y = 6.

2.Find the value of 7a - 2b when a = 5 and b = 8.

3.Find the value of 3m + 5n - 4 when m = 4 and n = 3.

4.Find the value of -3p + 4q when p = 6 and q = 7.

5.Find the value of 5r - 2s + 9 when r = 3 and s = -4.

Choose and match

Read each expression and value carefully.

6.When x = 3 and y = 4, what is the value of 2x + 5y?

7.Match each expression to its value when x = 2 and y = 5.

3x + y
x + 2y
4y - x
5x + 3y

Expressions in situations

Write an expression with two variables, then substitute the values to solve.

8.At a food bank, Lucy packs x boxes of cereal and y bags of rice. Each cereal box weighs 3 pounds and each rice bag weighs 2 pounds. Write an expression for the total weight, then find the weight when x = 4 and y = 5.

9.Emily sorts x cans of soup and y cans of beans for a food bank. Each soup can contains 4 servings and each bean can contains 3 servings. Write an expression for the total servings, then calculate the total when x = 6 and y = 2.

10.A rectangular storage mat is (2x + 3) feet long and (y + 2) feet wide. Write an expression for its perimeter, then find the perimeter when x = 4 and y = 3. Use P = 2(length + width).