"Vary directly" is another way of saying "directly proportional".
In simple English, this just means, as one increases, the other increases too.
a = 6
b = 4
The question says find out what a is when b is 16.
First, lets find how many times larger b has gotten.
16/4 = 4
b had gotten 4 times bigger to go from b=4 to b=16
If a is varying directly, it means that it will also get 4 times bigger.
Therefore, a = 6 x 4 = 24
Answer:
b=-12
Step-by-step explanation:
Answer:
(See explanation for further details).
Step-by-step explanation:
C) The linear system is:
After some algebraic handling:
By direct substitution:
D) The parameter values are: , ,
E) The quadratic equation is 
Answer:
the right is the answer :>
Step-by-step explanation:
Jasmine's rate is 1/10 alleys per hour
Together their rate is 1/4.44 alleys per hour.
Joe's rate must be
1/4.44 - 1/10 = 139/1110 alleys per hour
It would take Joe
1110/139 ≈ 7.99 hours to do an alley alone.
Let's call it 8 hours.
