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    dths1980's Avatar
    dths1980 Posts: 11, Reputation: 1
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    #1

    Jul 9, 2008, 07:15 AM
    Calculus
    Find the equation of the tangent line of the graph 3x+xy+1=0 at the point x= -1

    thank you
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jul 9, 2008, 07:51 AM
    Solve your equation for y, then find the derivative and plug in x=-1 to find the slope at that

    point. Then just use y=mx+b to find your equation. You'll have m,x,and y. So, just find b and

    you're done.

    Here is the graph with the tangent:
    Attached Images
     
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