I need help reviewing for a test i have tomorrow over y-intercept, x-intercept, Determining the Equation of a Line Passing Through Two Points, and other formulas and equations along those lines! Please send any advise, tips, and problems to practice that you can!! THANKS SOOO MUCH!! :)

## HELP ON MATH!!!!!!!!

# 1 Answer

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.

## Comments

Thanks this helps! :)

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