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natka813 [3]
3 years ago
15

Which set of coordinates satisfies the equations 3x − 2y = 15 and 4x − y = 20? (2, -7) (1, -6) (5, 0) (0, -7.5)

Mathematics
1 answer:
maxonik [38]3 years ago
5 0
I feel that the best way to solve is by using elimination method. This is what you do.....
3x - 2y = 15
4x -  y  = 20
Multiply the bottom equation with -2.
3x - 2y = 15
-8x + 2y = -40
Now add both equations.
-5x = -25
Divide.
x = 5
Now plug in your x-value into any one of the original equations.
3(5) - 2y = 15
15 - 2y = 15
Subtract 15 from both sides.
-2y = 0
Divide.
y = 0
So your solution is (5,0).
I hope this helps love! :)
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the ratio of apples to oranges in a fruit basket is 12:4 if there are 7 oranges in the fruit basket then how many apples and ora
Ugo [173]
Just simple proportions:

12(apples)          x(apples)
--------------   =   --------------
4(oranges)        7(oranges)

12*7 = 84
84/4 = 21

There are 21 apples + 7 oranges = 28 apples and oranges!
7 0
2 years ago
What is 54% into a decimal?
Novay_Z [31]

Answer:

0.54

Step-by-step explanation:

You take 54 and divide it by 100

54/100 =0.54

Hope this helps!!

7 0
2 years ago
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Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 22 days and
Alika [10]

Answer:

25.5 days

Step-by-step explanation:

Mean number of days (μ) = 22 days

Standard deviation (σ) = 6 days

Z-score for the 72nd percentile (according to tabulated values) = 0.583

The z-score for any number of days, X, is determined by:

z=\frac{X-\mu}{\sigma}

The value of X that is greater than 72% of the trial times is:

0.583=\frac{X-22}{6}\\ X=25.5\ days

Therefore, 72% of all of these types of trials are completed within 25.5 days.

6 0
3 years ago
Racionalize o denominador da equação abaixo:<br> 5 + 3 ²√5 / ²√5
GrogVix [38]
I hope this helps

\cfrac{5+3 \sqrt{5} }{ \sqrt{5} } =\cfrac{(5+3 \sqrt{5}) \sqrt{5}  }{ \sqrt{5}* \sqrt{5}  }= \cfrac{5 \sqrt{5}+15 }{5}  = \cfrac{5 (\sqrt{5}+3) }{5}  = \sqrt{5}+3
4 0
3 years ago
A student's grade depends on her score on four equally-weighted exams. Her average on the first three exams is 92. What must she
Sergeeva-Olga [200]
3x92 = 276 (first 3 exams)
average of at least 90 (90 x 4 = 360)

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Answer
<span>she needs to score at least 84 on the fourth exam </span><span>in order to guarantee a final average of at least 90</span>
4 0
3 years ago
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