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2 years ago

X-y=12 x+y=3 what is x and y and i need to show work ty

Mathematics

1 answer:

Bogdan [553]2 years ago

7 0

Answer:

x=12 y=9

Step-by-step explanation:

first we need to do this equation to get X

we don't have y so y=0

x-(0)=12

we eliminate the 0

x=12

now, we have X, now we need to find Y

substitution

x+y=3

12+y=3

y=3-12

y= 9

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sattari [20]

5 1/2 * 3 1/4

1 + 5 . 2/2 * 1 + 3 . 4/4 = 11/2 * 13/4 = 11 . 13/2 . 4 = 143/8 = 7 + 17 . 8/8 = 17 7/8

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Detailed explanation of solution:

5 1/2 * 3 1/4

Transform the first mix number to improper fraction:

5 1/2 = 1 + 5 . 2/2 = 11/2

Transform the second mix number to improper fraction:

3 1/4 = 1 + 3. 4/4 = 13/4

Multiplying two fractions:

11/2 * 13/4 = 11 . 13/2 . 4 = 143/8

Since the numerator is greater than the denominator, We convert the improper fraction to mix fraction:

143/8 = 7 + 17.8/8

= 17 7/8 (Decimal: 17. 875)

Hope that helps!!!!!! ( Answer: 17 7/8, (Decimal: 17.875)

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2 years ago

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3 years ago

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Vanyuwa [196]

Answer:

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Step-by-step explanation:

We are given that:

$\displaystyle \tan x = \frac{3}{7}$

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$\displaystyle \cos \left(90^\circ - x\right)$

Recall that by definition, tan(θ) = sin(θ) / cos(θ). Hence:

$\displaystyle \frac{\sin x }{\cos x} = \frac{3}{7}$

And by definition, sin(θ) = cos(90° - θ). Hence:

$\displaystyle \frac{\cos \left(90^\circ - x\right)}{\cos x} = \frac{3}{7}$

Multiply:

$\displaystyle \cos \left(90 ^\circ - x\right) = \frac{3}{7} \cos x$

Find cosine. Recall that tangent is the ratio of the opposite side to the adjacent side. Therefore, the opposite side is 3 and the adjacent side is 7.

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Thus:

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Use a calculator. Hence:

$\cos \left(90 ^\circ - x\right) \approx 0.1688$

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3 years ago