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charle [14.2K]
3 years ago
14

Log(1+y) - log(1-y) = log x in 2 decimal places, express y in terms of x

Mathematics
2 answers:
Bond [772]3 years ago
7 0
Express y in terms of x.

Log (1+y) - Log (1-y) = Log x
GaryK [48]3 years ago
6 0

Answer: y = \frac{x-1}{x+1}

Step-by-step explanation:

log(1+y) - log(1-y) = log x \\log\frac{1+y}{1-y} =log x\\x = \frac{1+y}{1-y}\\x(1-y)=1+y\\x-xy=1+y\\x-1 = xy+y\\y(x+1)=x-1\\y=\frac{x-1}{x+1}

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Solve with substitution. Show each step of your work<br><br> 4x + y = 12<br> 6x + 2y = 18
Svetach [21]
4x + y = 12
Get y by itself
Subtract 4x
y = -4x + 12

Since you know what y is, you can plug the value into the second equation

6x + 2(-4x + 12) = 18
6x - 8x + 24 = 18
-2x = -6
x = 3

Plug the value 3 into x for y = -4x + 12 in order to find y
-4(3) + 12 = y, y = 0

Solution: x = 3, y = 0
3 0
3 years ago
Change each standard form equation to slope-intercept form!
goldenfox [79]
Hello! 

Slope-intercept form is this one: y=a*x+b where a is the slope and b the intercept. 

So, for transforming these equations to Slope-Intercept you'll need to rearrange the equations by adding or subtracting the same amounts on both sides of the equation (as a rule of thumb, sums are transformed into subtractions and multiplications into divisions).

<span>1) 3x + y = 12

You should notice that Y and X are on the same side of the equation, so by subtracting 3x on both sides of the equation you'll cancel X on the left side:

</span>3x+y-3x=12-3x \\ y=12-3x
<span>
To finish, we rearrange this equation to the form y=a*x+b 

</span>y=-3x+12
<span>
So, the slope is -3 and the intercept is 12

2) 8=y+5x

</span>You should notice that Y and X are on the same side of the equation, so by subtracting 5x on both sides of the equation you'll cancel X on the right side:

8-5x=y+5x-5x \\ 8-5x=y

To finish, we rearrange this equation to the form y=a*x+b 

y=-5x+8

So, the slope is -5 and the intercept is 8

3) 6x + 3y = -9

You should notice that Y and X are on the same side of the equation, so by subtracting 6x on both sides of the equation you'll cancel X on the left side:

6x+3y-6x=-9-6x \\ 3y=-9-6x

Now, you should notice that y has a number that is multiplying it, so you'll need to divide the entire equation by 3 to cancel this number on the left side.

\frac{3}{3}y= \frac{9}{3}- \frac{6}{3}x  \\ y=3-2x

To finish, we rearrange this equation to the form y=a*x+b 

y=-2x+3

So, the slope is -2 and the intercept is 3

4) 
x - 5y = 55

You should notice that Y and X are on the same side of the equation, so by subtracting x on both sides of the equation you'll cancel X on the left side:

x-5y-x=-55-x \\ -5y=-55-x

Now, you should notice that y has a number that is multiplying it, so you'll need to divide the entire equation by -5 to cancel this number on the left side.

\frac{-5}{-5}y= \frac{55}{-5}- \frac{1}{-5}x \\ y=-11+ \frac{1}{5}x

To finish, we rearrange this equation to the form y=a*x+b 

y=\frac{1}{5}x-11


So, the slope is 1/5 and the intercept is -11

5) -4x-y=-2
You should notice that Y and X are on the same side of the equation, so by adding 4x on both sides of the equation you'll cancel X on the left side:

-4x-y+4x=-2+4x \\ -y=2+4x 

Now, you should notice that y has a number that is multiplying it, so you'll need to divide the entire equation by -1 to cancel this number on the left side.

\frac{-1}{-1} y= \frac{-2}{-1}+ \frac{4}{-1}x \\ y=2-4x

To finish, we rearrange this equation to the form y=a*x+b 

y=-4x+2

So, the slope is -4 and the intercept is 2

6) -16 = -4x + 2y

You should notice that Y and X are on the same side of the equation, so by adding 4x on both sides of the equation you'll cancel X on the right side:

-16+4x=-4x+2y+4x \\ -16+4x=2y

Now, you should notice that y has a number that is multiplying it, so you'll need to divide the entire equation by 2 to cancel this number on the right side.

\frac{-16}{2}+ \frac{4}{2} x= \frac{2}{2}y \\ -8+2x=y

To finish, we rearrange this equation to the form y=a*x+b 

y=2x-8

So, the slope is 2 and the intercept is -8

I hope that this helps. Have a nice day!
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