Question

Sanjay solved the equation below. Which property did he use to determine that 7x + 42 = 42 is equivalent to 7x = 0?

Answer 1

For this case we have the following expression:

$7x + 42 = 42$

From here, we must clear the value of x.

For this, we apply the following property :

• Substraction property of equality: Subtract the same number on both sides of equality.

We have then:

$7x + 42-42 = 42-42\\7x = 0$

Answer:

he used Substraction property of equality

Answer 2

Subtraction property of equality