Answer:
5:3
Step-by-step explanation:
100: 60
Divide each side by 20
100/20 : 60/20
5:3
Sure you could as long as you have the point.
for example let's say the slope is 2 and the point we are given is (4,4)
we know that:

plug in the values given
x=4
y=4
m=2

b, the y intercept equals -4.
so:

in this case