Data analysis and coordinate graphs

Advanced Math 5 · Unit 12 · mean-quadrant-i · Teacher edition

mean-quadrant-i

Name ______________________________Date ______________

1.
On a coordinate grid, point $P$ is $4$ units to the right of the origin and $7$ units up. What is the $y$ -coordinate of $P$ ?
Answer: ______________
2.
Mia's mean score on four spelling tests is $82$ . Her first three scores were $80$ , $85$ , and $78$ . What was her fourth score?
Answer: ______________
3.
A bus travels $40$ km every hour. Ali graphs the trip with time in hours on the horizontal axis and distance in km on the vertical axis. Which point shows the bus after $3$ hours?
1. (A)
  $(120, 3)$
2. (B)
  $(3, 40)$
3. (C)
  $(3, 120)$
4. (D)
  $(40, 120)$

Answer key — Data analysis and coordinate graphs

1.
7mean-quadrant-i-01
$P = (4, 7)$ . The $y$ -coordinate is $\mathbf{7}$ .
2.
85mean-quadrant-i-02
Sum $= 82 \times 4 = 328$ . The known scores total $243$ . Fourth score $= 328 - 243 = \mathbf{85}$ .
3.
(C)
$(3, 120)$
mean-quadrant-i-03
Distance $= 3 \times 40 = 120$ km, so the point is $(\text{time}, \text{distance}) = \mathbf{(3, 120)}$ . ( $(120, 3)$ swaps the coordinates; $(3, 40)$ uses the speed instead of the distance; $(40, 120)$ uses no time at all.)