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galina1969 [7]
4 years ago
14

Solve the equation 6x+7=8x-15

Mathematics
2 answers:
Andreas93 [3]4 years ago
5 0

Answer:

X = 11

Step-by-step explanation:

So, in order to solve this equation, we need to isolate x.

So, we are going to subtract 8x from the right side to get the x on one side. The equation should look like this:

-2x + 7 = -15

Now in order to get x all alone on one side, we need to subtract 7 from the left side.

-2x = -22

Now we just have to divide the -2 from x.

X = 11

FinnZ [79.3K]4 years ago
4 0

Answer:

x = 11

Step-by-step explanation:

6x + 7 = 8x - 15

Step 1: Subtract 8x from both sides.

6x+7−8x=8x−15−8x

−2x+7=−15

Step 2: Subtract 7 from both sides.

−2x+7−7=−15−7

−2x=−22

Step 3: Divide both sides by -2.

-2x/-2 = -22/-2

x = 11

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3 years ago
2 Select the correct answer. What is the inverse of function ? F(x)=10/9x+11 A.f-1(x)=9x-99/10 B.f-1(x)=9/10x+11 C.f-1(x)=9x+11/
Lilit [14]

Consider f(x)=y.

\begin{gathered} f(x)=y \\ x=f^{-1}(y) \end{gathered}

Simplify the equation f(x)=y to obtain the value of x in terms of y.

\begin{gathered} f(x)=y \\ \frac{10}{9}x+11=y \\ \frac{10}{9}x=y-11 \\ 10x=9y-99 \\ x=\frac{9y-99}{10} \end{gathered}

So inverse of function is,

f^{-1}(x)=\frac{9y-99}{10}

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6 0
1 year ago
(I will give you brainliest, if you answer.) iTunes is selling CD’s for $12 each. Best Buy is offering 5 free CD and charges $15
kherson [118]

Answer: At x= 25 there is a break even point .

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Let the number of CDs be x

For the case of iTunes,

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For the case of Best Buy,

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Number of CDs more than 5 = $15

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According to question,

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3 years ago
Please help???? Geometry
Musya8 [376]
Any line can be expresses as:

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First find the slope:

m=(2-0)/(8-0)=2/8=1/4 so we have thus far:

y=0.25x+b, we solve for b using any point on the line, (8,2)

2=0.25(8)+b

2=2+b 

0=b

So the line is:

y=.25x  which they might also express as y=x/4

The answer is E. (1/4)x


6 0
3 years ago
Read 2 more answers
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