ANSWER KEY
for Chapter 9 Test (T1-T9 in textbook)(In-class portion of test to be given Tuesday, 3/16/99)
T1. (x-5)^2/(2^2)+(y+3)^2/(4^2)=1
Ellipse containing (3,-3),(7,-3),(5,1),(5,-7)
T2. (x-4)^2/(6^2) - (y-2)^2/(3^2)=1
Hyperbola contains (10,2),(-2,-2)
Slope of asymptotes m = ±
0.5
T3. –(x+5)^2/(4^2)+(y-1)^2/(3^2)=1
Hyperbola contains (-5,-2),(-5,4)
Slope of asymptotes m = ±
0.75
T4. (x+3)^2+(y-8)^2£
25
Circle center (-3,8)
Radius = 5
T5. x+8 = 0.2(y-5)^2
Parabola
Vertex (-8,5)
x – intercept at (-3,0)
y – intercepts at approx. (0,11.3) and (0,-1.3)
T6. {(4,3), (4,-3), (-4,3), (-4,-3)}
T7. {(7,0), (-2,3), (-2,-3)}
T8. {(-4,-3), (1,2)}
T9. We will sketch these in class if anybody wishes to see them.
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Last updated: 15 Mar 1999