Posted by **Vilma** on Sunday, June 3, 2012 at 12:02am.

A temperature of 30 degrees F is equivalent to 271.89 degrees K, while a temperature of 94 degrees F is equivalent to 307.44 degrees K. Find the equation converting Kelvin temperature to Fahrenheit. What is the Fahrenheit temperature when it is 212 degrees K?

- Algebra -
**MathMate**, Sunday, June 3, 2012 at 8:00am
Assume a linear relationship of:

F=mK+b ....(1)

where m=slope, and b=intercept.

We have two given points, (271.89,30) and (307.44,94)

The standard formula for m (slope) is:

m=(y2-y1)/(x2-x1)=(94-30)/(307.44-271.89)=1.8

With m=1.8, substitute one of the points into equation (1) to find b:

30=1.8(271.89)+b

b=30-1.8(271.89)=-459.4

So the conversion equation is:

F=1.8K-459.4

I leave it to you to substitute K=212 in order to find the fahrenheit degrees.

- Algebra -
**Reiny**, Sunday, June 3, 2012 at 8:02am
Let F = aK + b , (treating it like the linear equation y = mx + b)

we have two points (271.89, 30) and (307.44, 94)

a = slope = (94-30)/(307.44 - 271.89) = 64/35.55

= 1.80028

let's go with 1.8

so F = 1.8K + b

sub in (271.89,30) to find b

30 = 1.8(271.89) + b

b = -459.48

F = 1.8K - 459.48

so when K = 212

F = 1.8(212) - 459.48 = -77.9° Fahrenheit

- To MathMate - Algebra -
**Reiny**, Sunday, June 3, 2012 at 8:04am
What's that saying again, some kind of minds thinking alike ?? lol

- Algebra -
**MathMate**, Sunday, June 3, 2012 at 8:07am
Great minds think alike! haha!

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