if 9x-3y = 12 and 3x-5y = 7 then what is 6x-2y = ?
[A] 5
[b] 8(correct)
[c] 11/4
[d] -2
[e] none

• [A] 5
  9x-3y=12......(1)
  3x-5y=7.......(2)
  By
  (1)-3*(2)
  solving
  y=-3/4 & x=7/12
  
  put x& y value in eq
  6x-2y=5
• 11 years agoHelpfull: Yes(2) No(4)
• Given:9x-3y=12 => 3(3x-y)=12 => (3x-y)=4 ---(1)
  To find: 6x-2y=2(3x-y)=2*4 (from eq 1)
  =8 so is the answer.
• 11 years agoHelpfull: Yes(2) No(0)
• ans:b) 8
  sol:
  9x-3y=12 subtract by 3x-5y=7
  then 6x+2y=5
  and 9x-3y=12 => 3x-y=4
  which is added to 3x-5y=7
  then 6x-6y=11
  now this is added to 6x+2y=5
  therefore 12x-8y=16 => 6x-4y=8
  
• 11 years agoHelpfull: Yes(1) No(3)
• ans is 8
  9x-3y=12
  3(3x-y)=12
  3x-y=4
  therefore 6x-2y=2(3x-y)=2*4=8;
• 10 years agoHelpfull: Yes(1) No(0)
• ans:b) 8
  sol:
  9x-3y=12 subtract by 3x-5y=7
  then 6x+2y=5
  and 9x-3y=12 => 3x-y=4
  which is added to 3x-5y=7
  then 6x-6y=11
  now this is added to 6x+2y=5
  therefore 12x-4y=16 => 6x-2y=8
• 11 years agoHelpfull: Yes(0) No(1)
• any other method to solve this problem?
• 11 years agoHelpfull: Yes(0) No(0)