MATH

posted by Anonymous

I still don't know how to completely solve systems by substitution. Can someone please help me?

1. Y=-11+x
3x+10y=-6
How would you know where to plug in the right section of the equation in a certain place?

2. Y =6x-5
Y =-x+9

  1. Steve

    substitute the value of a variable from one equation into the other equation. For #1, we are told

    y = x-11

    So, substitute that into the other equation, and we have

    3x + 10(x-11) = -6
    3x + 10x - 110 = -6
    13x = 104
    x = 8
    So, y = x-11 = 3
    Be sure to check the solution to make sure it satisfies both original equations.

    Now do #2 in just the same way.

  2. Anonymous

    Okay! On #2 how would you set it up since there's no equal signs

Respond to this Question

First Name

Your Answer

Similar Questions

  1. 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 …
  2. ALGEBRA 1!PLZ HELP!

    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 …
  3. algebra

    How do I do substitution equations out of the equations in the system, pick the one that has the least amount of funky numbers. then make that equation equal to either x or y(or any other variable dependin on what kind of systems youre …
  4. i really, really, really need help

    what coordinate point is the solution to the system?
  5. Algebra

    It does, thanks. I'm currently working on solving algebraic equations with two variables (Example: 3x+4y=9). The computer lesson has taught me nothing but to solve the equation by trial and error -- selecting the proper ordered pair …
  6. math

    Solve systems by substitution 5x - 2y = -5 y - 5x = 3 Substitute 5x + 3 for y in the first equation, and solve it for x. Once you have x, use either of the two equations you wrote to solve for y.
  7. Algebra

    I have some problems that I am having trouble with and I have some that need checking please. Thanks! Solve the equation. 4. (x+7/4)=2(x-1/6) Find all the value(s) of x that make thedenominator(s) zero. Then solve the equation. 6. …
  8. 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 …
  9. Math

    Solve the system using any algebraic method. 2x - 2y + z = 3 5y - z = -31 x + 3y + 2z = -21 ______________________ The answer I got for this is ( -26, 6,67) but I know its wrong and I don't know why. Help please >< my work is …
  10. Algebra PLEASE HELP!!

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

More Similar Questions