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3 votes
Which of the following sets of values is a solution to the following system of linear equations?

4x + y = 24

x - y = -4


A.) x = 4,y =8

B.) x = 2,y = 6

C.) x = 1,y = 1

D.) x = 5,y = 4

Also explain why.

User WAMLeslie
by
6.2k points

2 Answers

2 votes

Final answer:

After testing each of the given options in the system of equations, option A: x = 4, y = 8 is the only set of values that satisfy both equations, making it the correct solution.

Step-by-step explanation:

To determine which set of values is a solution to the given system of linear equations, we need to check which option satisfies both equations simultaneously:

Equations:
4x + y = 24
x - y = -4

We can substitute the given values from the options into the equations and check:

  1. For option A (x = 4, y = 8), the first equation gives us 4(4) + 8 = 24, which is true, and the second one gives us 4 - 8 = -4, which is also true. Hence, option A satisfies both equations.
  2. For option B (x = 2, y = 6), the first equation gives us 4(2) + 6 = 14, which is not 24, so it is not true for the first equation. Therefore, B is not a solution.
  3. For option C (x = 1, y = 1), the first equation gives us 4(1) + 1 = 5, which is not 24, so it is not true for the first equation. Thus, C is not a solution.
  4. For option D (x = 5, y = 4), the first equation gives us 4(5) + 4 = 24, which is true, but the second one gives us 5 - 4 = 1, which is not -4. Hence, D does not satisfy both equations either.

Therefore, the correct solution is option A: x = 4, y = 8.

User Judit
by
4.9k points
6 votes

Answer:

Option A.
x=4,y=8

Step-by-step explanation:

we have


4x + y = 24 -----> equation A


x-y=-4 -----> equation B

Adds equation A and equation B


4x + y = 24\\x-y=-4\\---------\\4x+y+x-y=24-4\\5x=20\\x=4

Find the value of y


x-y=-4


4-y=-4


y=4+4=8

User Darkmoor
by
4.7k points
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