Question

Mary is solving the equation 3(x+4)= 7x-20. The first thing she does is rewrite the equation as shown below. 3x + 12 = 7x - 20 Which property did Mary use to get from the original equation to her rewritten equation?

Adistributive property
B associative property of multiplication
C multiplicative property of equality
D commutative property of multiplication​

Answer 1

A. distributive property

Explanation:

The distributive property is when you multiply one term by both terms inside the parentheses and add the products.

Mary multiplied 3 by x and 4, which gives you 3x and 12.

Adding these (and combining it with the larger equation) gives us 3x + 12 = 7x - 20