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Alexxx [7]
3 years ago
13

How many solutions does the following system have? 2x+3y=1; -3x-2y=-1

Mathematics
1 answer:
zysi [14]3 years ago
8 0

Answer:

x = 1/5 , y = 1/5

Step-by-step explanation:

Solve the following system:

{2 x + 3 y = 1 | (equation 1)

-3 x - 2 y = -1 | (equation 2)

Swap equation 1 with equation 2:

{-(3 x) - 2 y = -1 | (equation 1)

2 x + 3 y = 1 | (equation 2)

Add 2/3 × (equation 1) to equation 2:

{-(3 x) - 2 y = -1 | (equation 1)

0 x+(5 y)/3 = 1/3 | (equation 2)

Multiply equation 1 by -1:

{3 x + 2 y = 1 | (equation 1)

0 x+(5 y)/3 = 1/3 | (equation 2)

Multiply equation 2 by 3:

{3 x + 2 y = 1 | (equation 1)

0 x+5 y = 1 | (equation 2)

Divide equation 2 by 5:

{3 x + 2 y = 1 | (equation 1)

0 x+y = 1/5 | (equation 2)

Subtract 2 × (equation 2) from equation 1:

{3 x+0 y = 3/5 | (equation 1)

0 x+y = 1/5 | (equation 2)

Divide equation 1 by 3:

{x+0 y = 1/5 | (equation 1)

0 x+y = 1/5 | (equation 2)

Collect results:

Answer: {x = 1/5 , y = 1/5

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Matt Bonner has 8 dimes, 9 pennies, and 4 quarters in his pocket. If each coin is equally likely to be pulled out of his pocket
Lesechka [4]

Answer:

B. 0.602%

Step-by-step explanation:

Probability is essentially (# times specific event will occur) / (# times general event will occur). Here, we have a few specific events: draw a quarter, draw a second quarter, draw a penny, and draw another penny. The general event will just be the number of coins there are to choose from.

The probability that the first draw is a quarter will be 4 / (4 + 8 + 9) = 4/21.

Since we've drawn one now, there's only 21 - 1 = 20 total coins left. The probability of drawing a second quarter is: (4 - 1) / (21 - 1) = 3/20.

The probability of drawing a penny is: 9 / (20 - 1) = 9/19.

The probability of drawing a second penny is: (9 - 1) / (19 - 1) = 8/18.

Multiply these four probabilities together:

(4/21) * (3/20) * (9/19) * (8/18) = 864 / 143640 ≈ 0.602%

The answer is B.

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3 years ago
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10. How I would solve it, is I would convert them into decimals so it is 7.5/.75.
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M 30 degrees <br> 9x-10<br> 10x+10
ivann1987 [24]

Answer:

m∠W = 80°

Step-by-step explanation:

To find m∠W, remember that:

One exterior angle of a triangle is equal to the sum of the other two interior angles.

Now apply this information.

Notice that point U has an exterior angle. It will be equivalent to the sum of m∠V and m∠W, or in algebraic from: U = m∠V + m∠W

Substitute the information we know.

U = m∠V + m∠W

10x + 10 = 30 + 9x - 10          Simplify the right side's like terms.

10x + 10 = 20 + 9x          Isolate "x"

10x - 9x + 10 = 20 + 9x - 9x          Subtract 9x from both sides

10x - 9x + 10 = 20          9x cancels out on the right side

x + 10 = 20          Simplified left side, 10x - 9x = x

x + 10 - 10 = 20 - 10          Subtract 10 from both sides

x = 20 - 10          "x" is isolated. Simplify right side.

x = 10          Solved for "x"

To find m∠W, substitute the value of "x" into the equation of its angle.

m∠W = 9x - 10

m∠W = 9(10) - 10          Multiply 9 and 10, then subtract 10 from the product.

m∠W = 80

Write with the units, degrees symbol °

Therefore the measure of ∠W is 80°.

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It's about C≈40.84 m

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