Question

what is the solution of the equation 4x +21 = -3​

Answer 1

Answer:

Step-by-step explanation:

// Solve equation [1] for the variable  y  

 

 [1]    y = -4x + 21

// Plug this in for variable  y  in equation [2]

  [2]    3x - 4•(-4x+21) = 49

  [2]    19x = 133

// Solve equation [2] for the variable  x  

  [2]    19x = 133  

  [2]    x = 7  

// By now we know this much :

   x = 7

   y = -4x+21

// Use the  x  value to solve for  y  

   y = -4(7)+21 = -7

Answer 2

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