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Home > Science > Mathematics   »   Calculus

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Old Jul 9, 2008, 06:15 AM
dths1980
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Calculus
Find the equation of the tangent line of the graph 3x+xy+1=0 at the point x= -1

thank you

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Old Jul 9, 2008, 06:51 AM   #2  
galactus
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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:
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