Metric system is based on powers of 10
6 : 10 = 3 : 5
24 : 40 = 3 : 5
36 : 60 = 3 : 5
42 : 70 = 3 : 5
A. 18 : 20 = 9 : 10 (incorrect)
B. 30 : 20 = 3 : 2 (incorrect)
C. 18 : 30 = 3 : 5 (correct)
D. 50 : 30 = 5 : 3 (incorrect)
The answer is C. 18 : 30
Hope this helps. - M
If you want it to be a slope intercept form, the first you have to find slope.
y2-y1/x2-x1
2-0/6-0
2/6 = 1/3
Then you need to find the y intercept. Plug in the x and y value in y=mx+b.
2=1/3(6)+b
2=2+b
0=b
ANSWER: y=1/3x+0
Hope this helps and is correct :)