Kevin S. answered • 01/24/13

So many topics... Let me address a few:

The x-intercept is where the line crosses the x axis, and the point is (x, 0). Similarly, the y-intercept is where the line crosses the y-axis, at (0,y).

Determine equation of line: Given two points (x1,y1) and (x2,y2), you can determine the slope (referred to as **m**) of the line by taking the difference in the y values over the difference in the x values (think "change in rise over change in run"):

slope m = (y2 - y1)/(x2 - x1)

You can then plug the slope and one of the points into the point slope form to get an equation for the line:

y - y1 = m(x - x1) . Work it through, combine like terms, and you have your equation.

Similar to point slope form is slope-intercept form, **y = mx + b** . When the equation is in this form, you can determine both the slope **m** and the y intercept **(0, b)** from this equation.

Standard form is Ax + By = C. With a little manipulation, you can work this into slope intercept form.

Cara C.

Thanks this helps! :)

01/24/13