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Math Help - [SOLVED] stumped on college algebra problem: equation of a line

  1. #1
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    [SOLVED] stumped on college algebra problem: equation of a line

    Here is the problem: http://img22.imageshack.us/my.php?image=...

    an answer is required for each box that you see, so could you please state what is supposed to go in each box.

    i've been working on this problem for 2 hours but can't figure it out. i would be very grateful for some help.
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  2. #2
    Member ssadi's Avatar
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    Quote Originally Posted by mathnotwiz View Post
    Here is the problem: http://img22.imageshack.us/my.php?image=...

    an answer is required for each box that you see, so could you please state what is supposed to go in each box.

    i've been working on this problem for 2 hours but can't figure it out. i would be very grateful for some help.
    y-2=-2(x-9)
    y=-2(x-9)+2
    =-2x+18+2=-2x+20
    So -2 goes in the first box, 20 goes in the second box
    The other two boxes are left blank. Notice the OR, it means you don't have to fill it up if it don't apply.
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  3. #3
    Air
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    Quote Originally Posted by mathnotwiz View Post
    Here is the problem: http://img22.imageshack.us/my.php?image=...

    an answer is required for each box that you see, so could you please state what is supposed to go in each box.

    i've been working on this problem for 2 hours but can't figure it out. i would be very grateful for some help.
    An equation for the linear line is y=mx+c where y,x are the variables, m is the gradient (slope) and c is the y-intercept (where it crosses y-axis).

    You are given the information: m= -2 and the co-ordinate (x,y) = (9,2). Putting this information into the equation and working out the value of c will get you your equation (and the gaps to be filled).

    y=mx+c
    \therefore 2 = -2(9) + c \rightarrow c = 20
    \therefore y = -2x+20
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