Answer:
Step-by-step explanation:
Volume = surface area of base * height
The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 F
1 answer:
Answer:
After 8 minutes will the temperature be 138.1 F
Step-by-step explanation:
Given that:
The water has been on the stove .....[1]
where
y represents the temperature in Fahrenheit(F)
x represents the time in minutes.
We have to find after how many minutes will the temperature be 138.1 F.
⇒y = 138.1 F
Substitute the given value in [1] to solve for x;
Subtract 62.1 from both sides we get;
Divide both sides by 9.5 we get;
8 = x
or
x = 8 minutes.
Therefore, after 8 minutes will the temperature be 138.1 F
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we know that in direct variation as x increase y also increases.
in indirect variation x decreases y increase and vice versa.
in part a we have x at top (numerator ) and y at denominator it mean indirect variation (as x increases y decreases).
to find k we know that for indirect variation xy=k
if we rewrite the equation x=9/y we get xy=9
which mean k=9 .
in part b we have 4xy=20 if we simplify this equation we get
so here if we rewrite in terms of x.
we get x=5/y which represents indirect variation.
and we know xy=k
we have xy=5 .so k=5