Algebra

posted by .

What is the value of x in the solution of this system?
-3x-y+2z = 7
2y+z= -5
3x+6y= -21

4
2
1
3

  • Algebra -

    thx :)

  • Algebra -

    add the 1st and 3rd
    5y + 2z = -14
    from the 2nd: z = -2y-5
    plug into 5y + 2z = -14
    5y + 2(-2y-5) = -14
    y = -4

    into the 3rd:
    3x -24 = -21
    3x =3
    x = 1

    btw: z = 3

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. algebra

    solve system graphically. be sure to check your solution. if a system has infinite number of solutions, use set builder notation to write the solution det. if a system as no solution, state this. a=1+b b=5-2a
  2. MAths

    Consider the following system of inequalities: (c−1)x^2+2cx+c+4≤0 ---- (1) cx^2+2(c+1)x+(c+1)≥0 ---- (2) The sum of all real values of c, such that the system has a unique solution, can be written as a/b, where a …
  3. algebra

    Consider the following system of inequalities: {(c-1)x^2+2cx+c+4<0 { cx^2 + 2(c+1)x+(c+1)>0 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime positive …
  4. algebra

    Consider the following system of inequalities: {(c−1)x^2+2cx+c+4≤0 cx^2+2(c+1)x+(c+1)≥0 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime …
  5. maths

    Consider the following system of inequalities: {(c−1)x^2+2cx+c+4≤0 cx^2+2(c+1)x+(c+1)≥0 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime …
  6. Intermediate Algebra

    Solve the following system of equations. x+4y=5 x=6-4y What is the solution of the system?
  7. algebra

    Which of the following ordered pairs is included in the solution set of the system, y < 2 - 2x and y > 2x -3?
  8. Algebra 1

    Solve each system graphically. Be sure to check your solution. If a system has an infinite number of solutions, use set-builder notation to write the solution set.If a system has no solution, state this. I tried this and found no solution, …
  9. Algebra

    Solve each system graphically. Be sure to check your solution.If a system has an infinite number of solutions, use set-builder notation to write the solution set.If a system has no solution, state this. 2x - y = 1 x + 2y = 3
  10. Algebra 1 check answers

    If you were solving a system of equations and you came to a statement like 1 = 3, what do you know about the solution to the system?

More Similar Questions