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user100 [1]
3 years ago
12

Solve both equations 8x + 7y = 39 4x – 14y = –68

Mathematics
2 answers:
Softa [21]3 years ago
6 0

Answer:

{x,y}={ 1/2, 5)

Step-by-step explanation:

[1]    8x + 7y = 39

[2]    4x - 14y = -68

Solve equation [2] for the variable  x

 [2]    4x = 14y - 68

 [2]    x = 7y/2 - 17

// Plug this in for variable  x  in equation [1]

  [1]    8•(7y/2-17) + 7y = 39

  [1]    35y = 175

// Solve equation [1] for the variable  y

  [1]    35y = 175

  [1]    y = 5

// By now we know this much :

   x = 7y/2-17

   y = 5

// Use the  y  value to solve for  x

   x = (7/2)(5)-17 = 1/2

zaharov [31]3 years ago
4 0

Answer:

x=1/2, y=5

Step-by-step explanation:

This can be solved using substitution!

<em>Hope this helped!</em>

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Step-by-step explanation:

The complete question is:

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