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lawyer [7]
3 years ago
8

Write the solution set for equation 7x - 2y = 8 with this replacement set: {(1,-1),(2,3), (0,-4), (4,10)}.

Mathematics
1 answer:
LenKa [72]3 years ago
5 0
The second one 
Hope that helps :) 

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Tìm kiếm x y z<br> x-1/y =1<br> y-1/z =1<br> z-1/x =1
const2013 [10]

<em>y</em> - 1/<em>z</em> = 1   ==>   <em>y</em> = 1 + 1/<em>z</em>

<em>z</em> - 1/<em>x</em> = 1   ==>   <em>z</em> = 1 + 1/<em>x</em>

==>   <em>y</em> = 1 + 1/(1 + 1/<em>x</em>) = 1 + <em>x</em>/(<em>x</em> + 1) = (2<em>x</em> + 1)/(<em>x</em> + 1)

<em>x</em> - 1/<em>y</em> = <em>x</em> - (<em>x</em> + 1)/(2<em>x</em> + 1) = (2<em>x</em> ² - 1)/(2<em>x</em> + 1) = 1

==>   2<em>x</em> ² - 1 = 2<em>x</em> + 1

==>   2<em>x</em> ² - 2<em>x</em> - 2 = 0

==>   <em>x</em> ² - <em>x</em> - 1 = 0

==>   <em>x</em> = (1 ± √5)/2

If you start solving for <em>z</em>, then for <em>x</em>, then for <em>y</em>, you would get the same equation as above (with <em>y</em> in place of <em>x</em>), and the same thing happens if you solve for <em>x</em>, then <em>y</em>, then <em>z</em>. So it turns out that <em>x</em> = <em>y</em> = <em>z</em>.

3 0
3 years ago
Solve for s.<br> S + 3s - 4 = 16<br> S =<br> Submit
const2013 [10]
The answer is 5 because 16+4=20 and 3s + s = 4s so you’re left with 4s = 20 and I know that 4 times 5 is 20.
ANSWER: S=5
3 0
3 years ago
Question
statuscvo [17]

Answer:

he used 1/4 yards per skhirt

7 0
3 years ago
The difference of a number times 2 and 7 is 9. (Use w for the unknown number)
asambeis [7]
2w-7=9
+7=+7
2w=16
2w/2=16/2
w=8
7 0
3 years ago
Number 14 NEED HELP NOW pls
inessss [21]

Answer:

E

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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