Answer:
k = ½
Equation => 
Step-by-step explanation:
Constant of proportionality (k) = y/x
Using a point on the graph, (6, 3),
k = y/x = 3/6 = ½
k = ½
Equation of the line:
Plug in the value of k into
(slope-intercept form of equation for proportional relationship)
Thus:

1/2*5 = 2.5 ~ 3 (round-off)
1/3* 10 = 3.33 ~ 3
2 tens, 4 ones, 3 tenths, 5 hundredths, 7 thousandths
Answer: $1,150 this month
Step-by-step explanation:
200-10 = 190
190+40 = 230
230*5 = 1,150