Nicholas Zhao Teaches Math | CBE: Algebra Prep

Question

$Which representation shows y as a function of x? x y x y −2 −7 −1 0 A 0 C −1 5 1 8 −1 10 9 18 −1 15 x y x y −5 −4 −8 B 0 0 D 0 3 1 1 1 2 12 −4 10$ Open full-size question

A.
$Answer A: Answer A (see image)$
B.
$Answer B: Answer B (see image)$
C.
$Answer C: Answer C (see image)$
D.
$Answer D: Answer D (see image)$

Question

$An oil-well contractor drills a shaft 7 meters deeper into the ground every 2 hours. Which graph has a slope that best represents this rate? yDepth of Shaft over Time yDepth of Shaft over Time 0 0 −5 −10 F −10 H −20 −15 −30 −20 x−40 01234567891x 012345678910 0 Time (hours) Time (hours) yDepth of Shaft over Time yDepth of Shaft over Time 0 0 −17.5 −1 G −35.5 J −2 −52.5 −3 −70.0 01234567891x −4 01234567891x 0 0 Time (hours) Time (hours)$ Open full-size question

A.
$Answer A: Answer F (see image)$
B.
$Answer B: Answer G (see image)$
C.
$Answer C: Answer H (see image)$
D.
$Answer D: Answer J (see image)$

Proportionality

Sample questions