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VladimirAG [237]
3 years ago
13

One number is seven more than three times another number. If the sum of the numbers is 15, find the numbers.

Mathematics
1 answer:
dimulka [17.4K]3 years ago
4 0

Answer:

2 and 13

Step-by-step explanation:

We can use systems of equations here to find both the numbers. Let's assume one of the numbers is x and the other is y.

We know that these numbers add up to 15, so x + y = 15.

We also know that one of these numbers is 7 more than 3 times the other, so x = 3y + 7.

We can now substitute the equation x = 3y + 7 into x + y = 15.

(3y + 7) + y = 15

Combine like terms:

4y + 7 = 15

Subtract 7 from both sides:

4y = 8

Divide both sides by 4:

y = 2.

Now that we know the value of y, we can substitute it inside an equation to find x. Let's substitute it inside x + y = 15.

x + 2 = 15\\\\x = 15-2\\\\x = 13

So the two numbers are 2 and 13.

Hope this helped!

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2*cosx*(2x+30°) + √3=0
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Answer: x  ≈  1.59688927,  −1.60312387,  −4.67045686,  4.69039614,  7.872914,  −7.91513776,  −10.89002194

Step-by-step explanation:

Solve for  x  by simplifying both sides of the equation, then isolating the variable.

Simplify 2*cosx*(2x+30°) + √3=0

    Simplify each term.  

       Apply the distributive property.

  • 2  cos ( x )   ( 2 x )  + 2  cos ( x )  * 30 °  + √ 3 = 0
  • Multiply  2  by  2
  • 4  cos ( x )  x  +  2  cos ( x )  *30 ° + √ 3 = 0
  • Multiply  30 °by  2  
  • 4 cos ( x )  x  +  60 cos ( x ) + √ 3 = 0
  • Reorder factors in 4 cos ( x ) x + 60 cos ( x ) + √3
  • 4xcos(x)+60cos(x)+√3=0
  • Graph each side of the equation. The solution is the x-value of the point of intersection. x ≈ 1.59688927 , − 1.60312387 , − 4.67045686 , 4.69039614 , 7.872914 , − 7.91513776 , − 10.89002194

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