2 years ago

Am trying to find the value of r 1/r + 2/1-r = 4/r^2

1 answer:

6 0

1/r + 2/1-r = 4/r^2

1-r+2r/r(1-r)=4/r^2
(1+r)/r(1-r)=4/r^2 cancle r both side

1+r/1-r=4/r

cross multiply
r+r^2=4-4r
r^2+4r+r-4=0
r^2+5r-4=0
r^2+4r+r-4=0
solve it for r factor it...

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zysi [14]

Answer:

(14, -2)

Step-by-step explanation:

To solve by using substitution, begin by solving for a variable in the first equation. Let's solve for x:

$x+8y=-2\\x=-2-8y$

Now we know what x equals. Let's substitute this into the second equation:

$x-3y=20\\(-2-8y)-3y=20$

We can then simplify:

$-2-8y-3y=20$ Given equation

$-2-11y=20$ Combine y terms

$-11y=22$ Add 2

$y=-2$ Divide by -11

So, we now know the value of y = -2.

To find the value of X, we can substitute the value of Y into one of the equations. Let's use the first one:

$x+8y=-2$

$x+8(-2)=-2$ Substitute for y

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So, we now know the value of x = 14.

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3 years ago

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Elenna [48]

Answer:

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Step-by-step explanation:

8=8p+13-3p

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Zinaida [17]

Not sure but I think it's (3)

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Westkost [7]

Answer:

(#30) 1.12 miles

Step-by-step explanation:

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5,12,13

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answer: square root 169=13

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3 years ago