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nicole10

  • 2 years ago

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

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  1. josecastaneda
    • 2 years ago
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    True

  2. josecastaneda
    • 2 years ago
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    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.

  3. josecastaneda
    • 2 years ago
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    |dw:1330406766557:dw|

  4. josecastaneda
    • 2 years ago
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    then just solve for x

  5. nicole10
    • 2 years ago
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    thank you i understand now

  6. josecastaneda
    • 2 years ago
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    |dw:1330406799210:dw|

  7. nicole10
    • 2 years ago
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    true or false? the x-intercept of the line with equation -3x+2y=5 is (-5/3,0)

  8. josecastaneda
    • 2 years ago
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    true

  9. nicole10
    • 2 years ago
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    i dont understand

  10. josecastaneda
    • 2 years ago
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    because to find the x intercept you have to set the y intercept to 0

  11. mathg8
    • 2 years ago
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    The previous problem was False ... you can solve for x and back substitute also !

  12. mathg8
    • 2 years ago
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    it doesn't matter for which variable you're solving

  13. josecastaneda
    • 2 years ago
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    ? 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

  14. josecastaneda
    • 2 years ago
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    your gonna have to back substitute

  15. josecastaneda
    • 2 years ago
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    for the second equation

  16. nicole10
    • 2 years ago
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    how do you get -5/3 for x i am getting -5

  17. josecastaneda
    • 2 years ago
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    |dw:1330407174168:dw|

  18. josecastaneda
    • 2 years ago
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    and your y would be 0

  19. jerwyn_gayo
    • 2 years ago
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    in finding the y-intercept, assume that the value of x is zero, or vice versa. .

  20. radar
    • 2 years ago
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    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.

  21. radar
    • 2 years ago
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    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

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