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2 answers:
Answer:
y = .5x +15
The graph is a line.
The slope is .5 and the y intercept is 15. The flat fee is the y intercept and the cost per mile is the slope.
Step-by-step explanation:
The flat fee is the y intercept and the cost per mile is the slope
The total cost for the day is equal to the cost per mile * the number of miles driven plus the flat fee. Let x be the number of miles driven and y be the total cost for the day.
We can use y = mx+b
y = .5x +15
When we graph, x must be greater than 0 because we cannot drive negative miles.
The slope is .5 and the y intercept is 15. The flat fee is the y intercept and the cost per mile is the slope.
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Answer:
The present age of Sam is 20 years .
Step-by-step explanation:
Given as :
Let The age of John = J years
Let The age of Sam = S years
∵ Sam is 12 years older than John
so, The age of Sam = 12 + The age of John
i.e S = 12 + J .....1
<u>Again</u>
Before 5 years ago
The age of Sam = 5 times age of John
So, (S - 5) = 5 × (J - 5)
Or, S - 5 = 5 J - 25
Or, 5 J - S = 25 - 5
Or, 5 J - S = 20 .........2
Solving eq 1 and eq 2
[5 J - (12 + J)] = 20
Or, 5 J - 12 - J = 20
Or, 4 J = 20 + 12
Or, 4 J = 32
∴ J =
i.e J = 8 years
So, The age of John = J = 8 years
Put The value of J into eq 1
∵ S = 12 + J
So, S = 12 + 8
i.e S = 20 years
So, The present age of Sam = S = 20 years .
Hence, The present age of Sam is 20 years . Answer