Substitution

Front

What is substitution in mathematics?

Back

Substitution is the process of replacing a variable with a number or another expression to simplify or solve an equation.

Front

If a variable 'x' is equal to 4, what is the value of the expression 2x + 3?

Back

2(4) + 3 = 8 + 3 = 11.

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 numbers.

Front

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

Back

2 + 3 = 5.

Front

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

Back

Area = length × width.

Front

If l = 5 and w = 4, what is the area of the rectangle?

Back

Area = 5 × 4 = 20.

Front

Back

3(5) - 2 = 15 - 2 = 13.

Front

Back

3 + 5 + 2 = 10.

Front

Back

5 + 3 = 8.

Front

Back

2(5) = 10.