Question

Using graphical method solve this equation
x+y=1
x+2y=7

Answer 1

Answer:{x,y} = {3,2}

Step-by-step explanation:

// Solve equation [2] for the variable  x

 [2]    x = -2y + 7

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

  [1]    (-2y+7) - y = 1

  [1]     - 3y = -6

// Solve equation [1] for the variable  y

  [1]    3y = 6

  [1]    y = 2

// By now we know this much :

   x = -2y+7

   y = 2

// Use the  y  value to solve for  x

   x = -2(2)+7 = 3

Solution :

{x,y} = {3,2}

  Processing ends successfully  

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Terms and Topics

Linear Equations with Two Unknowns

Solving Linear Equations by Substitution

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