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. 👍 0
  2. 👎 0
  3. 👁 440
asked by Matthew

  1. is it (5,-1)

    1. 👍 0
    2. 👎 0
    posted by help

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

    1. 👍 0
    2. 👎 0
    posted by Anonymous

  3. 9.0-17.8x-6.1x+6.1y=0
    12.0-8.3y-6.1y+6.1x=0

    1. 👍 0
    2. 👎 0
    posted by Daryll

  4. -2x-6y=1
    x=-3y+2

    1. 👍 0
    2. 👎 0
    posted by Nettie

  6. 8m+n=3

    1. 👍 0
    2. 👎 0
    posted by janice

  7. m-2n=11

    1. 👍 0
    2. 👎 0
    posted by tony

  8. 10x+11.1111

    1. 👍 0
    2. 👎 0
    posted by ersgerg

  9. no

    1. 👍 0
    2. 👎 0
    posted by bob

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

    1. 👍 0
    2. 👎 0
    posted by Anonymous

  12. §ur13

    1. 👍 0
    2. 👎 0
    posted by poco

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

    1. 👍 0
    2. 👎 0
    posted by Anonymous

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

    1. 👍 0
    2. 👎 0
    posted by chris

  15. knfnkasnga
    \

    1. 👍 0
    2. 👎 0
    posted by ericka

  16. i need help on substitution method

    1. 👍 0
    2. 👎 0
    posted by susssie

  18. 2x-y=0 3x+y=-5

    1. 👍 0
    2. 👎 0
    posted by toya

Respond to this Question

First Name

Your Response

Similar Questions

  1. Linear Equations

    Can you please help solve this equation using the substitution method? I have tried and keep getting that X and Y = 7/2, but the answer in the book states no solution, inconsistent system. What am I doing wrong? Please help! Solve

    asked by Mia on March 2, 2010

  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

    asked by zwgz123 on December 15, 2017

  3. 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

    asked by Alyssa on April 5, 2011

  4. Algebra 1 HELP PLZ!!!

    Use the Substitution method to solve the system of equations. x + y = -4 x - y = 2 PLz HELP!! I'M NOT BOB BUT I CAN HELP ITS REALLY SIMPLE ALGEBRA X + Y = -4......EQN 1 X - Y = 2.....EQN 2 From EQN 2, let x = 2 + y Substitute that

    asked by Margie on November 2, 2006

  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

  6. algebra

    Can someone help me figure this out please? when you solve a system of equations by the substitution method, how do you determine whether the system of equations is inconsistent? thank you anyone

    asked by don on March 18, 2012

  7. calculus

    When using the substitution method to solve a nonlinear system of equations, you should first see if you can _____ one variable in one of the equations in the system.

    asked by heaven on January 28, 2010

  8. algebra

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

    asked by algebra on March 21, 2012

  9. algebra

    when you solve a system of equations by the substitution method, how do you determine whether the system of equations is dependent?

    asked by Stephanie on October 28, 2010

  10. 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

    asked by slomo on January 7, 2015

  11. 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? Thanks

    asked by algebra need help on March 1, 2012

More Similar Questions