Question

One point on the line y=2x+3 has coordinates:

Answer 1

If x=0, y=?

Answer 2

There could be millions of coordinates on the line... Do what @shamim said and you can find the y-intercept of the line :)

Answer 3

just put a value for x and find the corresponding value of y
like if x=1
y=2+3

if x=2
y=4+7
and so on..