Algebra 1

bobpursey, In this problem you helped me with earlier:

Solve using any appropriate method.

y = 2× - 5,

y = ½× + 1

Substitution, substitute for y.

2×-5=½ × + 1

3/2 x=6

x=4

y= 2*4-5=3

How did you choose which method you were going to use between substitution and elimination? Could this have done with the elimination method? Thanks

  1. 👍 0
  2. 👎 0
  3. 👁 285
  1. Since both equations were in the form y = ...
    he simply replaced the y value of the first equation with the y value of the second.
    Some texts call this the "comparison" method
    e.g.
    if a = b
    and c = b , then a = c

    yes, you could use elimination after some doctoring of the equations
    y = 2x - 5 ---> 2x - y = 5
    y = (1/2)x + 1 ---> 2y = x + 2 --> x - 2y = -2

    new first by 2: --> 4x - 2y = 10
    new 2nd : ------> x - 2y = -2
    subtract them:
    3x = 12
    x = 4
    back in the original first:
    y = 2(4) - 5 = 3

    x=4 , y = 3

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. history

    Which option accurately describes the significance of the scientific theories of Isaac Newton? A. Newton’s theories helped scientists understand the significance of germs and sterilization. B. Newton’s theories helped

    asked by michael on December 13, 2018
  2. math-

    A new model of car is available in 4 exterior colors and 3 interior colors. Use a tree diagram and specific colors to show how many color schemes are possible for the car. Solve the problem using an alternative method as well.Note

    asked by Mike on August 10, 2009
  3. 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

    asked by SANDRO! on November 6, 2006
  4. Simplex Method

    Solve the linear programming problem by the simplex method. Maximize P = 10x + 6y subject to x + y < 80 3x < 90 x > 0, y > 0 x = y = P =

    asked by Leah on April 24, 2011
  5. 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

    asked by Svetlana on October 17, 2006
  1. Calculus - Volume by Integration

    Find the volume of the solid generated by revolving the region bounded by the given lines and curves about the y-axis: y=(x-2)^3-2, x=0, y=25 (a)solve by either the disk or washer method (b)solve by the shell method (c)state which

    asked by Nicole on November 24, 2013
  2. PSY 210

    Complete the following chart. The first column shows the name of a research method used in psychology. In the second column, write a brief description of that research method. In the third column, provide a situation when this

    asked by MIKE THOMPSON on November 17, 2008
  3. Grade 11th Maths

    This problem is related to Chapter-Sets. Please solve the question using x method. x method means x ∈ A ∩ B Q. If A⊂B, then prove that B'⊂A'

    asked by Akash on June 29, 2010
  4. Algebra

    The problem is 9x+4y=-12 x=26-5y Solve by substitution method

    asked by Vic on July 3, 2011
  5. English

    1. He helped to organize the party. 2. He helped to arrange the party. 3. He helped to prepare the party. 4. He helped to prepare for the party. -------------------------------- Can we use all the expressions? Which ones are

    asked by rfvv on October 6, 2017
  6. algebra

    I have tried these problem cannot get the answer so could some one help me. Solve by the subsitution method. 2x-7y=-11 2x +17=y What is the solution of the system.

    asked by Keaton on March 26, 2009

You can view more similar questions or ask a new question.