April 25, 2013
MULTIPLE CHOICE, NO CALCULATOR
If x3+2x2y-4y=7, and x=1,
(A) -9
2
(B) 0
(C) -8
=
(D) -3 (E) 7
2
to determine y when x=1: (1)3+2(1)2y - 4y=7
1+2y-4y=7
-2y=6
y=-3
April 25, 2013
Vertical and Horizontal Tangents
x +xy+y =27
2
2
-2x-y
=
x+2y
Determine the point(s) where the graph is
horizontal.
April 25, 2013
Vertical and Horizontal Tangents
x +xy+y =27
2
2
-2x-y
=
x+2y
Determine the point(s) where the graph is
vertical.
April 25, 2013
Vertical and Horizontal Tangents
x2+xy+y2=27
=
-2x-y
x+2y
Determine if there is a horizontal tangent at
the x-intercepts.