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den301095 [7]
3 years ago
6

The relationship between the Fahrenheit (F) and Celsius (C) temperature scales is given by the linear function below.

Mathematics
1 answer:
AlexFokin [52]3 years ago
6 0
relationship \ is \ expressed \ by : \\\\ F =  \frac{9}{5}\cdot  C +
 32 \\ \\ this \ equation \ is \ in \ the \ slope-intercept \ form \ of \
 y = mx + b \ where:\\\\"m"  \ is \ the \ slope \ and \ "b" \ is \ the \
 y-intercept \\\\ slope : \ m=\frac{9}{5} \\ \\y-intercept : \ 
b=32

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If 2(4x + 3)/(x - 3)(x + 7) = a/x - 3 + b/x + 7, find the values of a and b.
zmey [24]

Answer:

a=3 and b=5.

Step-by-step explanation:

So I believe the problem is this:

\frac{2(4x+3)}{x-3}(x+7)}=\frac{a}{x-3}+\frac{b}{x+7}

where we are asked to find values for a and b such that the equation holds for any x in the equation's domain.

So I'm actually going to get rid of any domain restrictions by multiplying both sides by (x-3)(x+7).

In other words this will clear the fractions.

\frac{2(4x+3)}{x-3}(x+7)}\cdot(x-3)(x+7)=\frac{a}{x-3}\cdot(x-3)(x+7)+\frac{b}{x+7}(x-3)(x+7)

2(4x+3)=a(x+7)+b(x-3)

As you can see there was some cancellation.

I'm going to plug in -7 for x because x+7 becomes 0 then.

2(4\cdot -7+3)=a(-7+7)+b(-7-3)

2(-28+3)=a(0)+b(-10)

2(-25)=0-10b

-50=-10b

Divide both sides by -10:

\frac{-50}{-10}=b

5=b

Now we have:

2(4x+3)=a(x+7)+b(x-3) with b=5

I notice that x-3 is 0 when x=3. So I'm going to replace x with 3.

2(4\cdot 3+3)=a(3+7)+b(3-3)

2(12+3)=a(10)+b(0)

2(15)=10a+0

30=10a

Divide both sides by 10:

\frac{30}{10}=a

3=a

So a=3 and b=5.

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Yes because fraction wise the denominator that is the smallest is greater. At least that is what I learned
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