Question

Which property of equality should you use to solve the equation for x? -3x = 21

A. The division property of equality
B. The subtraction property of equality
C. The addition property of equality
D. The multiplication property of equality

Answer 1

A. The division property of equality

Explanation:

To get x you need to find a way to get it by itself, which can be done by dividing -3 from both sides of the equation (which is the division property of equality).

For example,

-3x=21

/-3 /-3

x=21/-3

x=-7