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Ugo [173]
3 years ago
14

X=2y-4 7x+5y=-66 solve by elimination

Mathematics
1 answer:
Alexxandr [17]3 years ago
3 0

Answer:

{x,y}={-8,-2}

Step-by-step explanation:

 [1]    x = 2y - 4

Plug this in for variable  x  in equation [2]

  [2]    7•(2y-4) + 5y = -66

  [2]    19y = -38

Solve equation [2] for the variable  y

  [2]    19y = - 38

  [2]    y = - 2

By now we know this much :

   x = 2y-4

   y = -2

Use the  y  value to solve for  x

   x = 2(-2)-4 = -8

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