Substitution

Front

What is substitution in mathematics?

Back

Substitution is a method of replacing a variable in an expression or equation with a specific value.

Front

If x = 5, what is the value of 2x + 3?

Back

2(5) + 3 = 10 + 3 = 13.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with their respective values.

Front

If a = 2 and b = 3, what is the value of a + b?

Back

2 + 3 = 5.

Front

What is the formula for finding the area of a rectangle?

Back

Area = length × width.

Front

If y = 4, what is the value of 3y - 2?

Back

3(4) - 2 = 12 - 2 = 10.

Front

What is the value of 5x if x = 2?

Back

5(2) = 10.

Front

If c = 7, what is the value of 2c + 1?

Back

2(7) + 1 = 14 + 1 = 15.

Front

What is the value of -2y + 3 if y = 5?

Back

-2(5) + 3 = -10 + 3 = -7.

Front

If a = 3 and b = 4, what is the value of 4a - b?

Back

4(3) - 4 = 12 - 4 = 8.