X-9 Which graph shows the solution set of 7x+2
SO?
-1 0 1 2 3 4 5 6 7 8
9 10 x
htt
-1 0 1
2 3 4 5 6 7
8
20
+
-1 0 1 2 3 4 5 6 7 8
9 10
十ll
-1 0 1 2 3 4 5 6 7 8
9 10 /

Huong is organizing paperback and hardback books for her club's used book sale. the number of paperbacks is 12 less than three times the number of hardbacks. huong had 162 paperbacks. how many hardback books were there?