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| PAGE: 769 | SET: Exercises | PROBLEM: 96 |
The equation is 
at the point 
.
The system of equations are 
.
Substitute 
in .
The equation is in the form of quadratic equation.
The general form of quadratic equation is 
.
Here 
, 
and 
.
There is one solution to the quadratic if the discriminant 
equals to 
.
Substitute corresponding values.
.
The tangent line 
passes through the point 
.
Substitute 
in 
.
.
Substitute 
in .
.
Substitute and 
in .
.
Therefore, the line equation is 
.
The line equation is .
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