Answer:
a = 10
Step-by-step explanation:
Since the quantities vary directly then the equation relating them is
y = kx ← k is the constant of variation
To find k use the point (2, 5 ) with x = 2 and y = 5
k = = = 2.5
y = 2.5x ← equation of variation
Using the point (4, a) with x = 4, then
y = a = 2.5 × 4 = 10
The variables are y and x
y ∞ x
y = kx
Where k is the constant of proportionality
Considering the first point
(4,a)
y = a and x = 4
a = 4k .......(1)
and (2,5)
y = 5 and x = 2
5 = 2k ..........(2)
k = 5/2
And a = 4k
a = 4(5/2)
a = 2×5
The equation is
y = 5x/2
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2nd is the correct answer for your question
Answer:$210
Step-by-step explanation: 7% of $1000 = $70 x 3yrs =$210