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Math Help - graphing

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    graphing

    how do i find the equation of a line, that is on a grid?
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by angiek723 View Post
    how do i find the equation of a line, that is on a grid?
    recall, a line is of the form y = mx + b where m is the slope and b is the y-intercept.

    identify two points the line passes through, this is usually easy on a grid.

    call one point (x_1,y_1) and the other (x_2,y_2)

    find the slope:

    m = \frac {y_2 - y_1}{x_2 - x_1}

    then plug that value for m into the point slope form:

    y - y_1 = m(x - x_1)

    solve for y and you're done
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