Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

nicole10

true or false? In order to solve a system of equation by substitution, you MUST always solve for y in one of the equations and hen back-substitute

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    True

    • 2 years ago
  2. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    because for example if you have to unknowns and two equations, ex: y=x+5 and the other says x=y-6.....then you would have to back substitue the y=x+5 into the value for y in the second equation.

    • 2 years ago
  3. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1330406766557:dw|

    • 2 years ago
  4. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    then just solve for x

    • 2 years ago
  5. nicole10
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you i understand now

    • 2 years ago
  6. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1330406799210:dw|

    • 2 years ago
  7. nicole10
    Best Response
    You've already chosen the best response.
    Medals 0

    true or false? the x-intercept of the line with equation -3x+2y=5 is (-5/3,0)

    • 2 years ago
  8. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    true

    • 2 years ago
  9. nicole10
    Best Response
    You've already chosen the best response.
    Medals 0

    i dont understand

    • 2 years ago
  10. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    because to find the x intercept you have to set the y intercept to 0

    • 2 years ago
  11. mathg8
    Best Response
    You've already chosen the best response.
    Medals 0

    The previous problem was False ... you can solve for x and back substitute also !

    • 2 years ago
  12. mathg8
    Best Response
    You've already chosen the best response.
    Medals 0

    it doesn't matter for which variable you're solving

    • 2 years ago
  13. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    ? if you have and equation with two unknows you wont be able to solve for x....for ex: y=x+5, solve for x? you cant

    • 2 years ago
  14. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    your gonna have to back substitute

    • 2 years ago
  15. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    for the second equation

    • 2 years ago
  16. nicole10
    Best Response
    You've already chosen the best response.
    Medals 0

    how do you get -5/3 for x i am getting -5

    • 2 years ago
  17. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1330407174168:dw|

    • 2 years ago
  18. josecastaneda
    Best Response
    You've already chosen the best response.
    Medals 1

    and your y would be 0

    • 2 years ago
  19. jerwyn_gayo
    Best Response
    You've already chosen the best response.
    Medals 0

    in finding the y-intercept, assume that the value of x is zero, or vice versa. .

    • 2 years ago
  20. radar
    Best Response
    You've already chosen the best response.
    Medals 0

    true or false? In order to solve a system of equation by substitution, you MUST always solve for y in one of the equations and hen back-substitute The answer is false. And as far as y=x+5 you can solver for x. getting x=y-5 You can solve for either x or y (assuming you have two equations with two unknowns x, and y. Choosing the one that is most convenient and then substitute the value found in the remaining unknown.

    • 2 years ago
  21. radar
    Best Response
    You've already chosen the best response.
    Medals 0

    true or false? the x-intercept of the line with equation -3x+2y=5 is (-5/3,0) First put equation in the slope intercept form: You will get y=(3/2)x+5/2 The y intercept is 5/2

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.