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3 years ago

Solve the equation 3.5z-2.7z=-6

Mathematics

2 answers:

zysi [14]3 years ago

5 0

First you do 3.5z-2.7z= .8z then you divide .8 with -6, which gives you -7.5 so z= -7.5

svlad2 [7]3 years ago

3 0

Answer: The value of z is -0.75.

Step-by-step explanation:

The given equation is $3.5z-2.7z=-6$

In term to solve it to find z , we first simplify the left side.

By using distributive property : $ba+ca=(b+c)a$ , we get

$(3.5-2.7)z=-6\\\\\Rightarrow 0.8z=-6$

Now , Divide both sides by 0.8 , we will get

$z=\dfrac{-6}{0.8}=\dfrac{-60}{8}\\\\\Rightarrow\ z=-7.5$

Hence, the value of z is -0.75.

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SOLUTION

If the table represents an inverse variation, it means that y is inversely proportional to x, written as

$\begin{gathered} y\propto\frac{1}{x} \\ \propto is\text{ a sign of proportionality } \end{gathered}$

Removing the proportionality sign and introducing a constant k, we have

$\begin{gathered} y=k\times\frac{1}{x} \\ y=\frac{k}{x} \end{gathered}$

In the first column, we have x = -4 and y = 3.5. Substituting these values for x and y, we have

$\begin{gathered} y=\frac{k}{x} \\ 3.5=\frac{k}{-4} \\ k=3.5\times-4 \\ k=-14 \end{gathered}$

So, if it's an inverse variation, the relationship would be

$y=\frac{-14}{x}$

In the second column, x = -2 and y = 7.

Now lets substitute the value of x for -2. If we get y to be 7, then the relationship is an inverse variation

We have

$\begin{gathered} y=\frac{-14}{x} \\ y=\frac{-14}{-2} \\ y=7 \end{gathered}$

Since we got y = 7, the relationship is therefore an inverse variation.

The constant k = -14

The equation for the inverse variation is

$y=\frac{-14}{x}$

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Step-by-step explanation:

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64,000 exponential function

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