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SpyIntel [72]
1 year ago
11

The sum of three times a number and a second number is five. two times the first number added to the second number is 10. find t

he two numbers.
Mathematics
1 answer:
Aneli [31]1 year ago
7 0

Answer:

-5 , 20

Step-by-step explanation:

<h3>Forming system of linear equations and solving:</h3>

Let x and y be the first and second number respectively.

3x + y = 5 -------------(i)

       y = 5 - 3x

2x + y = 10 -------------(ii)

Method used for solving: substitution method.

Substitute y = 5 - 3x in equation (ii)

   2x + 5 - 3x = 10

   2x - 3x + 5 = 10

Combine like terms,

        -x + 5  = 10

Subtract 5 from both sides,

               -x = 10 - 5

                -x = 5

Multiply the entire equation by (-1)

                \sf \boxed{\bf x = -5}

y = 5 - 3*(-5)

 = 5 + 15

\sf \boxed{\bf y =20}

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Read 2 more answers
Savannah sells character images online. Small images take one hour to make and she sells them for $15. Large images sell for $25
tatiyna

Answer:

15x + 25y ≥ 400

x + 2y ≤ 20

x ≥ 0, y ≥ 0

Step-by-step explanation:

Here, we are modelling the total number of hours she can use in making images in a week and the total amount that can be earned in a week, considering the given constraints.

Number of small images in a week = x

Number of hrs in making images if it takes 1 hr to make 1 = 1*x = x

Number of large images in a week = y

Number of hrs in making large images if it takes 2 hrs to make 1 = 2*y = 2y

Given that she has up to 20 hrs to make the images, therefore, the inequality that models this situation would be:

x + 2y ≤ 20

This implies that, the hours spent altogether can be less than or equal to 20hrs

Amount for small images = $15

Amount in total for all images made in a week = $15*x = 15x

Amount for large images = $25

Amount in total for all images made in a week = $25*y = 25y

Given that she can earn AT LEAST $400 in a week, therefore, the inequality that models this situation would be:

15x + 25y ≥ 400

This implies that, the amount she wants to make in a week would be $400 or more.

The system of inequalities would be:

x + 2y ≤ 20

15x + 25y ≥ 400

x ≥ 0, y ≥ 0

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3 years ago
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