The Addition Property of Equality justifies Emily's first step. She added 9 to both sides, canceling out the minus 9 while keeping the equation equal.
Answer:
multiply 4x12 and leave it inside the parenthesis, then multiply the 3 with 48
Answer:
I would say 2 because the decimal I came out with was 2.09
Step-by-step explanation:
5x+2y = 20
For every hardcover book (x) you will be charged 5$.
For every paperback book (y) you will be charged 2$.
The amount of both types of books you buy has to be under or equal to 20$
Answer:

Step-by-step explanation:
Given:

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