Question

Zoe is solving the equation 3x – 4 = –10 for x.

She used the addition property of equality to isolate the variable term as shown.

3x – 4 = –10

3x – 4 + 4 = –10 + 4

3x = – 6

Which two properties of equality could Zoe use to finish solving for x?

either the addition or subtraction property of equality
either the multiplication or division property of equality
either the addition or multiplication property of equality
either the subtraction or division property of equality

Answer 1

Either the multiplication or division property of equality.

Divide both sides by 3 (or multiply by 1/3): 3x = −6 ⇒ x = −6/3 = −2.