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Thread: Slope AND y-intercept!!

  1. #1
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    Arrow Slope AND y-intercept!!

    Gawsh Im stumped and I need help fast!

    I need to know the slope and the y-intercept of the following equations:

    y= 3x + 5
    y= -6x + 3
    y= -3/4x - 1
    y= 5/-4x
    y= 7 + 4x
    y= -x/5 + 6

    (Oh yah the slashes are for fractions!)
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  2. #2
    Senior Member topher0805's Avatar
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    1) $\displaystyle y = 3x + 5$

    This equation is of the form $\displaystyle y = mx + b$, where $\displaystyle m$ is the slope and $\displaystyle b$ is the $\displaystyle y$-intercept.

    Therefore, the slope is $\displaystyle 3$ and the $\displaystyle y$-intercept is $\displaystyle 5$.

    2) $\displaystyle y= -6x + 3$

    Same thing here. Slope is $\displaystyle -6$ and $\displaystyle y$-intercept is $\displaystyle 3$.

    3) $\displaystyle y= -3/4x - 1$

    Once again, same format. Slope is $\displaystyle -3/4$ and $\displaystyle y$-intercept is $\displaystyle -1$.

    4) $\displaystyle y= 5/-4x$

    Is this what you mean? $\displaystyle y = \frac {-5}{4}x$

    If so, the slope is $\displaystyle \frac {-5}{4}$ and the $\displaystyle y$-intercept is $\displaystyle 0$.

    Basically the same thing for each one.
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