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Tcecarenko [31]
2 years ago
12

14 less than a number is 2 more than 9 times a number

Mathematics
1 answer:
nataly862011 [7]2 years ago
7 0

Answer:

-2

Step-by-step explanation:

Let the number be  'x'

x - 14 = 2 + 9x

Subtract x from both sides

- 14 = 2 + 9x - x

-14 = 2 + 8x

Subtract 2 from both sides

-14-2 = 8x

 -16 = 8x

Divide both sides by 8

-16/8 = x

x = -2

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This is a mixture problem.

Let the 9 karat gold to be mixed be x. The 18 karat would weight (200 - x). Since the total = 200g.

mass1 * karat1 + mass2*karat = total mass * total carat

Let mass1 be x g.          mass 2 would be = (200 -x)
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Total mass = 200g.
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9*x  + 18*(200 -x) = 14*200

9x + 18*200 - 18*x = 14*200

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Read 2 more answers
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This is the answer
2x + y = 10 \\ y =  - 2x + 10

if substitute 1 and 2 and 3 as x then the points will be :
\binom{x}{y}   \:  \:  \:  \:  \:  \: \binom{1}{8} \:  \:  \:  \:  \:  \:  \binom{2}{6}   \:  \:  \:  \:  \:  \:  \binom{3}{4}


and that's the picture



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