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2. 12, 3, 42
3. P must lie on plane p 1 since the point
has an x-coordinate of 5, and doesn’t
have a y-coordinate of 6.
4.
y
2
8. a.
z
c.
z
1
–2 0 2
–1
–2
x
x
y
x
y
z
b.
z
10. a.
z
x
y
x
y
x
y
c.
z
b.
z
5. a. i. x-intercept 9,
y-intercept 6,
no z-intercept
ii. x-intercept 40,
y-intercept 30,
z-intercept 24
iii. no x-intercept,
y-intercept 3,
z-intercept 39
b. i. (0, 0, 1), 13, 2, 02
ii. (4, 3, 0), 15, 0, 32
iii. (1, 0, 0), (0, 1, 13)
6. a. i. (0, 0, 0), (1, 2, 0), (0, 5, 1)
ii. 2x y 0
b.
z
d.
x
x
z
y
y
c.
x
z
y
x
7. yz-plane, xz-plane, xy-plane
y
9. a.
b.
y1x 22 0
2
1
–2 –1 0 1 2
–1
–2
y
x
y z 1 11. a.
x
3
y
x
b.
c.
4
x
5 z 6
7 1
z
8 1
680 Answers
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