Question

Q.3 Solve by comparison method.
3x-5y=11; 4x+5y=3
C101​

Answer 1

Answer:

// Solve equation [2] for the variable  x  

 

 [2]    4x = 5y - 3

 [2]    x = 5y/4 - 3/4

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

  [1]    3•(5y/4-3/4) + 5y = -11

  [1]    35y/4 = -35/4

  [1]    35y = -35

// Solve equation [1] for the variable  y  

  [1]    35y = - 35  

  [1]    y = - 1  

// By now we know this much :

   x = 5y/4-3/4

   y = -1

// Use the  y  value to solve for  x  

   x = (5/4)(-1)-3/4 = -2

Step-by-step explanation:

Answer 2

Answer:

7x=14 so x = 2

3*2-5y=11

5y =6-11

y=-1

Step-by-step explanation:

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