posted by .

solve system of equation


  • algebra -

    I would use elimination and start with the z's
    Add the first plus the second to get
    10x - y = -48

    Double the second and add it to the third to get 13x - 5y = -55

    ahhh, changed my mind, let's now switch to substitution
    from above 10x - y = -48 or
    y = 10x + 48

    sub that into
    13x - 5y = -55
    13x - 5(10x + 48) = -55

    etc. (I got x=5)

    I am sure you can finish it from here.

  • algebra -

    I am coming up with (-5,-2,4) for my answer and I see you x=5

  • algebra -

    good job
    You can tell your answers are correct by merely subbing them back into the 3 original equations, they work


Respond to this Question

First Name
School Subject
Your Answer

Similar Questions


    Use the Substitution method to solve the system of equations. y - 2x = -5 3y - x = 5 Solve the first equation for y. y = 2x-5 Substitute that for y in the second equation and solve for x. Then use the value of x to substitute back …
  2. Math- Algebra

    hi wat method would i use and how would i solve this system of equations x^2+xy=3 3x^2+2xy-2y^2=7 In your first equation, solve for y... you should have xy= -x^2+3... divide this by x... so y = x^2+3/x plug what you solved for y into …
  3. Algebra

    To solve the system of equations, which expression could be substituted for x into the first equation?
  4. algebra

    my question is this how do you solve this equation?
  5. Algebra

    Show equation AX=B represents a linear system of two equations in two unknowns. Solve the system and sustitute into the matrix equation to check results. A=|1,2| |-3,5|, X=|x[1]x[2]|, B=|-4 12|
  6. Algebra

    Solve the system of equation by graphing. Then classify the system. 3x + y = 4, 4x + 5y = -24. Solution: Infinitity many solutions, no solution, System inconsistent/ consistent, Equation dependent/ independent.
  7. math

    Please explain in detail how to solve each question: At a certain high school, 350 students are taking an algebra course. The ratio of boys to girls taking algebra is 33:37. How many more girls are taking algebra than boys?
  8. Algebra Multiple Choice

    Hello, This is the last of questions I have for my practice assignment. Again I will put what I got. Thanks for your help. 1.) Solve the system using substitution. Write answer as an ordered pair. 4x+2y=8 -5x-2=y A.) First equation …
  9. Algebra 1

    What is an equation of a line perpendicular to the line with equation y = 1 - 3x a.y=-3x + 5 b. y=3x + 5 c.y=-1/3x + 5 d. y=1/3x + 5 To solve the linear system below, which substitution of unkowns is proper ?
  10. Algebra

    Explain how you can determine from the graph of a system of two linear equation in two variables whether is an inconsistent system of equation. 2. When you solve a system of equation by the substitution method how do you determine …

More Similar Questions