Line ab contains points a (1, 2) and b (−2, 6). the slope of line ab is (4 points)

a
zero

b
undefined

c
positive

d
negative

question 2 (4 points)
(06.02 mc)
line ab contains (0, 4) and (1, 6) line cd contains points (2, 10) and (−1, 4). lines ab and cd are (4 points)

a
parallel, because the slopes are the same

b
perpendicular, because the slopes are the same

c
parallel, because the product of the slopes is −1

d
perpendicular, because the product of the slopes is −1

question 3 (4 points)
(06.02 lc)
the equation of line ab is (y−3) = 5 (x − 4). what is the slope of a line perpendicular to line ab? (4 points)

a
−5

b
5

c
negative 1 over 5

d
1 over 5

question 4 (4 points)
(06.02 mc)
the equation of line cd is y = −2x − 2. write an equation of a line parallel to line cd in slope-intercept form that contains point (4, 5). (4 points)

a
y = −2x + 13

b
y = negative 1 over 2 x + 7

c
y = negative 1 over 2 x + 3

d
y = −2x − 3

question 5 (4 points)
(06.02 mc)
the equation of line qr is y = negative 1 over 2 x + 1. write an equation of a line perpendicular to line qr in slope-intercept form that contains point (5, 6). (4 points)

a
y = 2x + 16

b
y = negative 1 over 2 x + 17 over 2

c
y = − 1 over 2 x + 7 over 2

d
y = 2x − 4