4a + 7b = 38 -> (1)
9a + 7b = 68 -> (2)
Subtract (1) from (2),
9a - 4a + 7b - 7b = 68 - 38
5a = 30
a = 6
5/6 is the answer. Hope this helps you!
It’s 20f-30g I just took that question on a test
Answer:
5 rooms
Step-by-step explanation:
4 rooms = 9 hours
9 hours = 540 minutes
1 room = 540 ÷ 4 = 135 minutes
60 x 12 = 720 minutes (12 hours)
720 ÷ 135 = 5.33333
5.3333 estimated to nearest whole number = 5
Answer:
y=20
Step-by-step explanation:
0.6(y-10)=6
0.6y-6=6
0.6y=6+6
0.6y=12
y=12/0.6
y=20
the mistake is added 10 to both sides
