Question

How do you solve this using additional method elimination
3x + y = 17
4x - y = 18

Answer 1

// Solve equation [1] for the variable  y 
 

[1] y = -3x + 17

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

  [2] 4x - (-3x+17) = 18   [2] 7x = 35

// Solve equation [2] for the variable  x 

  [2] 7x = 35    [2] x = 5 

// By now we know this much :

  x = 5   y = -3x+17

// Use the  x  value to solve for  y 

  y = -3(5)+17 = 2 Solution : {x,y} = {5,2}  
Is the answer