1. Questions

Substitution Method in Algebra!HELP PLZ!

Use the Substitution method to solve the system of equations.

3x + y = 5
4x - 7y = -10

multiply first equation by 4
multiply second equation by 3
thus both equations have same x or y value in this case it is the x value.

12x + 4y = 20
12x - 21y = -30

solve by elimination then plugin values back of x into equation to find y.

So what would the next step be?Can you solve at least half of it for me?

okay well subustitiion is pretty easy!
you have to solve for x and y right?
well take the equation that has x or y by itslef in this case:
3x + y = 5
and solve for y!
y=5-3x
well you may ask why I did that well put y=5-3x into the second equation and solve for x!
okay if id no't get it!
4x - 7y = -10
4x - 7(5-3x) = -10

now do the rest solve for x!

after you have x you put into the first equation you used whcih was
3x + y = 5
and solve for y
show me thew work you did and what your answer is and I will check it for you!


Does x= 1.343
Also,y=2?
PLease help me!!!LOL!Can you help m with all the problems I need help with?

3x+ y = 5
y = 5 - 3x

therefore
4x - 7(5-3x) = -10
4x - 35 + 21x = - 10
25x = 25
x = 1

therefore

plug x back into either equation

so 3*-1 + y = 5
y = 5 -3
y = 2

Oh OK!Thanks can you help me with the rest of my problems that I don't get??PLz!!!

MY BAD SORRY!!!!!

maybe, maybe not...

PLz!But I am going to start a new topic thing at the top because it is getting hard to come all the way done here to respond!PLZ HELP!

x= -1 + 2y
x= 9 - 2y

Solve each system by the substitution method if there is no solution or an infinity number of solution, so state and use notation to express solution set.
n=53p+1600 53+1600 =
n=75+320 75+320= n=395

Determine whether the given ordered pair is a solution of the system.
x+2y=5
2x-y=15

Pg 261
How many calculations can be sold and supplied at $12 per calculator.
a)Per calculator.
B)Find the price at which supply and demand are equal. At this price, how many calculators of this type can be supplied and sold each week.

3x-y=11
2x-5y=13

2(2x-3y)=0
7x=3(2y+3)+2

Pg 282 #4
The sum of three times a first number and twice a second number is 43. If the second numbers subtract from twice the first number, the result is-4. Find the numbers.
Pg 284 #20
Avocado Calories 650 Carbohydrates 86
Apple Calories 10 Carbohydrates

y=2.5

  1. 👍
  2. 👎
  3. 👁
Matthew

  1. is it (5,-1)

    1. 👍
    2. 👎
    help

  2. x=y-1
    y=4-2x

    1. 👍
    2. 👎
    Anonymous

  4. 9.0-17.8x-6.1x+6.1y=0
    12.0-8.3y-6.1y+6.1x=0

    1. 👍
    2. 👎
    Daryll

  5. -2x-6y=1
    x=-3y+2

    1. 👍
    2. 👎
    Nettie

  6. 8m+n=3

    1. 👍
    2. 👎
    janice

  8. m-2n=11

    1. 👍
    2. 👎
    tony

  9. 10x+11.1111

    1. 👍
    2. 👎
    ersgerg

  10. no

    1. 👍
    2. 👎
    bob

  12. s+t=-4,s-t=4

    1. 👍
    2. 👎
    Anonymous

  13. §ur13

    1. 👍
    2. 👎
    poco

  14. y=6x
    2x+3y=-20

    1. 👍
    2. 👎
    Anonymous

  16. x + y = -4
    x - y = 2

    1. 👍
    2. 👎
    chris

  17. knfnkasnga
    \

    1. 👍
    2. 👎
    ericka

  18. i need help on substitution method

    1. 👍
    2. 👎
    susssie

  20. 2x-y=0 3x+y=-5

    1. 👍
    2. 👎
    toya

  21. 3x-y=5 and x+y=11

    1. 👍
    2. 👎
    Ellen

Respond to this Question

First Name

Your Response

Similar Questions

  1. How do I do this.?(Math.)

    Use the Substitution method to solve the system of equations. y - 2x = -5 3y - x = 5 Solve one of the equations for x or y. Let's solve the first one for y: y - 2x = -5 y = 2x - 5 Now let's substitute 2x - 5 for y in the second

  2. Algebra PLEASE HELP!!

    What advantages does the method of substitution have over graphing for solving systems of equations? Choose the correct answer below. A. Graphing cannot be used to solve dependent or inconsistent systems due to the nature of the

  3. Math

    1. For the following system of equations, what is the x-value of the solution? -x+2y=6 6y=x+18 a. -18 b. 0*** c. -6 d. 3 2. Solve the following system of equations using substitution. What is the value of y? 2x+3y=105 x+2y=65 a.

  4. Algebra

    When is the substitution method a better method than graphing for solving a system of linear equations?

  1. Math

    1. Explain the advantages and disadvantages of both the substitution method and the elimination method for solving a system. Help please. The only reasons I can think of is because in substitution it might be more difficult cause

  2. 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

  3. Math (check plz)

    y = 2x + 4 2x - y = 6 Solve the system of equations using substitution. A) (2,8) B) (2,-8) C) (10,24) D) no solution

  4. Pre-Calc

    Solve the system of equations using either the substitution method or the multiplication/addition method answer: 3x+2y=14 2x-4y=4

  1. Algebra

    Solve the system of linear equations using the substitution method. 3x + 3y = 0 -6x + 9y = -10

  2. algebra

    Solve the given system by the substitution method. 3x + y = 17 5x -2y = 10

  3. algebra

    Solve the following system using the substitution method: 6x - 2y = -4 y = 3x + 2

  4. 0303 math

    Solve the system by the substitution method y=-2x-4 5x-2y=-1

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