Substitution method to solve system of equations

posted by .

y - 2x = -5
3y - x = 5

Please help me out.

  • Substitution method to solve system of equations -

    change to first equation to
    y = 2x - 5

    now sub that into the second one

    3y - x = 5
    3(2x-5) - x = 5
    6x - 15 - x = 5
    5x = 20
    x = 4

    now put that value of x into y = 2x - 5
    y = 2(4) - 5
    = 8-5
    = 3

    check in
    #1 : 3 - 8 = -5 checks!
    #2 : 9 - 4 = 5 checks!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Substitution Method

    Use the Substitution method to solve the system of equations. x + y = -4 x - y = 2 x + y = -4 x - y = 2 In the second equation, x= y+2 Putting that in the first.. (y+2) + y= -4 subtract two from each side, then divide each side by …
  2. Substitution Method-Plz help

    Use the Substitution method to solve the system of equations. x + y = -4 x - y = 2 solve for x in the second equation. x= y+2 Put that in for x in the first equation: x+y=-4 (y+2) + y = -4 solve for y. Then, x= y+2 i don't get it.How …
  3. Linear Equations

    Can you please help solve this equation using the substitution method?
  4. algebra

    i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of equations …
  5. algebra

    Can someone please help. When you solve a system of equations by the substitution method, how do you determine whether the system of equations is inconsistent?
  6. algebra

    Can someone help me figure this out please?
  7. algebra

    When you solve a system of equations by the substitution method, how do you determine whether the system of equations is inconsistent?
  8. Algebra

    I can find no solution to this system of equations. Solve the system of equations using the substitution method 2x + 4y = -2 2x - y = 4
  9. Algebra Help Please

    solve the system of equations using the substitution method 8x - 9 = y y - 8x = 4
  10. Algebra PLEASE HELP!!

    What advantages does the method of substitution have over graphing for solving systems of equations?

More Similar Questions