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Math Help - Finding Y-Intercept

  1. #1
    HTS
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    Finding Y-Intercept

    I've been given a problem on finding the y-intercept, and i've been given one set of points (along with the slope) to find out the y-intercept. Now, I'm not allowed to graph, and I dont know any equation on finding the y-intercept, so can anyone help out?
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    Quote Originally Posted by HTS View Post
    I've been given a problem on finding the y-intercept, and i've been given one set of points (along with the slope) to find out the y-intercept. Now, I'm not allowed to graph, and I dont know any equation on finding the y-intercept, so can anyone help out?

    It is easiest to see the intercept in the form y=mx+b where b is the y-intercept and m is the slope.

    Use the point (x,y) and the slope (m) and plug it into the equation above. Plugging in y, x, and m will only leave you with b and you can solve for the y-intercept.

    It's good to know that y=mx+b is called the "point-slope" form of a line..if my memory serves me correctly.
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    MHF Contributor Reckoner's Avatar
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    Quote Originally Posted by elizsimca View Post
    It's good to know that y=mx+b is called the "point-slope" form of a line..if my memory serves me correctly.
    This is actually the slope-intercept form. The name makes sense when you see that the slope is m and the y-intercept is (0,\;b), as you pointed out.

    The point-slope form uses the slope m and a point (x_0,\;y_0) on the line:

    (y - y_0) = m(x - x_0)

    However, your advice to the OP is certainly sound.
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    Quote Originally Posted by Reckoner View Post
    This is actually the slope-intercept form. The name makes sense when you see that the slope is m and the y-intercept is (0,\;b), as you pointed out.

    The point-slope form uses the slope m and a point (x_0,\;y_0) on the line:

    (y - y_0) = m(x - x_0)

    However, your advice to the OP is certainly sound.
    AHH!! I knew it didn't sound right..hence the disclaimer at the end. I had the epiphany as I was eating my dinner and was going to come back and edit my comment..but you caught me!!
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