math please help

Solve the system by addition.
2x-4y=7
4x+2y-1

  1. 👍 0
  2. 👎 0
  3. 👁 74
asked by kim
  1. 2x-4y=7
    4x+2y-1(I guess that's = 1 and not -1?)
    =======================================
    multiply equation 2 by 2 to obtain
    8x+4y=2
    then add equation 1. Can you procedd now? The y term cancels, leaving just the x term and a number. Solve for x first.

    1. 👍 0
    2. 👎 0
    posted by DrBob222
  2. please help

    1. 👍 0
    2. 👎 0
    posted by Anonymous

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    So I've been working on solving this system by addition/subtraction and I just can't get the right answer. Her is the system of equations I was given to solve by add/sub: 3x – y = –12 x + 2y = –18

    asked by jririfi on July 20, 2014
  2. Algebra 1

    Solve the following system by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent. 10x+2y=7 y=-5x+3

    asked by BB on December 27, 2007
  3. Algebra 1

    Solve each of the following system by addition. If a unique solution does not exist,state whether the system is inconsistent or dependent. equation is like this x+5y=10 -2x-10y=-20

    asked by Candy on September 3, 2007
  4. math

    Solve this system 10x+2y=7,y=-5x+3 by addition or substitution. If a unique solution does not exist state if the system is dependent or inconsistent.

    asked by james b on January 22, 2008
  5. need help in math,

    Translate to a system of equations and solve using the addition method. The sum of two numbers is88. The difference is 22.Find the numbers? My answer: I started but i think that i am wrong. x + y = 88 y = -x +88 y = -1x + 88 now

    asked by jasmine20 on January 13, 2007
  6. Algebra 2345678!!

    Solve the system of equations using the Addition method. 2a + 3b = -1 3a + 5b = -2 The addition method tells you to find common multiples of a coefficient, then add the equations together to eliminate a variable. If you multiply

    asked by Margie on October 14, 2006
  7. Chemistry

    Consider the following equilibrium: H2CO3 (aq) ↔ H2O (l) + CO2 (g) Which direction will the equilibrium shift (left or right) if we: Increase the pressure by decreasing the volume of the system: Increase the pressure by adding

    asked by Anonymous on February 19, 2013
  8. Math

    Solve the system by addition or substitution. 3x – 4y = 8 6x – 2y = 10 Please get me on the correct track for 3x -4y =8 x=4, y=1 for 6x - 2y =10 x= 2, y= 1 Solve one equation for x. 3x = 4y + 8 x = (4y + 8)/3 Insert that value

    asked by Amanda on May 20, 2007
  9. mATH, ALGEBRA

    i need help solving the system by addition. 5x-7y=5 x+3y=1 this is what i think but i am not sure 3y=-x+1 y= -(1/3)x+(1/3) 5x - 7 (-1/3x + 1/3) = 5 5x+2.3333331x-2.3333331=5 7.3333331x-2.3333331=5 7.3333331x=7.3333331 x=1 x+3y=1

    asked by jasort120 on April 13, 2007
  10. Algebra 1

    Solve the system by addition. 5x-3y=13 4x-3y=11

    asked by Cynthia on September 13, 2007
  11. Algebra

    Solve the system by addition 2x-4y=7 4x+2y=9

    asked by Need Help! on June 4, 2007

More Similar Questions