Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Trending News

Promoted
peep_216
peep_216 asked in Science & MathematicsMathematics · 1 decade ago

find the equation of the linear function f using the information f(4)=1 and f (8)=7?

i need help on my math hw

2 Answers

Relevance
  • Maria Descartes
    Lv 7
    1 decade ago
    Favorite Answer

    Look:

    f(x)=ax+b

    f(4)=1

    4a+b=1

    and f (8)=7

    8a+b=7

    {8a+b=7 -

    {4a+b=1

    ---------------

    4a=6

    a=6/4

    a=3/2

    4a+b=1

    4.3/2+b=1

    6+b=1

    b=1-6

    b=-5

    f(x)=3x/2-5

    or

    f(x)=(3x-10)/2

  • Anonymous
    1 decade ago

    /first find the slope, which is 7/3 for this equation.

    now set the equation equal to the slope.

    7/3 = (y-8) / (x-7)

    And solve it.

    the equation would be:

    y = 7/3*x - 25/3 or

    f(x) = 7/3*x -25/3

    Try by plotting x. you will get the results f(4) = and f(7) = 8

Still have questions? Get your answers by asking now.