Anne bought a necklace for each of her three sisters he paid $7 for each necklace. suppose she had $9 left. write and solve an equation to find how much money anne had initially to spend on each sister.

. Anne has 3 sisters
. she buys each sister a necklace
. 1 necklace = $7
. she has $9 left after buying the necklaces

necklace=a
money had to spend per sister= b

3a + 9 = b×3

3×a + 9 = b×3
3×7 + 9 = b×3
21 + 9 = b×3
30 = b×3
30 ÷ 3 = b
10 = b

Anne initially had $10 to spend on each sister.

Well, if she spent $7 for a necklace for 3 people, multiply 7 by 3 and you get 21. If she had 9 dollars left, you add that to 21. 21+9=30. there were 3 sisters, so divide 30 by 3 and you get $10 dollars for each sister.

The answer for this is 9/1253decimal form 0.007