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Math Help - slopes and lines

  1. #1
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    Unhappy slopes and lines

    We were assigned a homework page over Xmas break, and then everyone forgot about it due to a large amount of tests, so we just got around to grading it, and i've forgotten how to do the problems...
    i did every problem but one before winter break, and i left my math book at school, so i have no idea how to do it...i wrote it down, however, so i can ask about it...i have to go to bed in 20 minutes, can someone please help me?
    Write an equation of each line in slope-intercept form
    each line (a, b, c) are going down at the same angle, with a rise/run of either (-1, 1) or (1, -1) depending on how you look at it. Line A intercepts at (0,4), Line B intercepts at (0, 2), and (2, 0), and Line C intercepts at (0, 0).
    i know its vague, but im short on time, and i don't have the book to scan the graph...if anyone can understand and help me with this, it would be greatly appreciated.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Forkmaster View Post
    We were assigned a homework page over Xmas break, and then everyone forgot about it due to a large amount of tests, so we just got around to grading it, and i've forgotten how to do the problems...
    i did every problem but one before winter break, and i left my math book at school, so i have no idea how to do it...i wrote it down, however, so i can ask about it...i have to go to bed in 20 minutes, can someone please help me?
    Write an equation of each line in slope-intercept form
    each line (a, b, c) are going down at the same angle, with a rise/run of either (-1, 1) or (1, -1) depending on how you look at it. Line A intercepts at (0,4), Line B intercepts at (0, 2), and (2, 0), and Line C intercepts at (0, 0).
    i know its vague, but im short on time, and i don't have the book to scan the graph...if anyone can understand and help me with this, it would be greatly appreciated.
    i think you mean the lines are parallel. which means they have the same slope.

    we can find the slope for B, by using the formula m = \frac {y_2 - y_1}{x_2 - x_1}, where (x_1,y_1) and (x_2,y_2) are the points B passes through.

    this will be the same slope for all three lines. we now use the point-slope form to get the equation of the lines.

    by the point-slope form, the equation of a line with slope m that passes through the point (x_1, y_1) is given by:

    y - y_1 = m(x - x_1)

    expand the brackets on the right and solve for y to get it in the slope-intercept form

    can you continue?
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