Most elementary, . Here y is proportional to x. Passes through the origin so y-intercept is 0. Based on the idea that a line is determined once we know its slope and one point on the line - . Solve the previous problem using the point-slope method.
Lines are parallel when they have the same slope and different y-intercepts.
Part 1 Parallel Part 2 Perpendicular - Let m new be the new slope. . Now find the y-intercept. The smaller m, the slower the line is rising. Negative slope line is decreasing Zero slope line is horizontal 4. Black Thread Method Find a best-fit line by moving a piece of thread among the points.