# Math Help - slopes and lines

1. ## 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.

2. Originally Posted by Forkmaster
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?