Question

how to tell if an equation is a positive y-intercept

Answer 1

you set x = 0, and see if the y-value is positive or not

Answer 2

what?

Answer 3

Do you have a graph or an equation?

Answer 4

as moneybird said
for example the equation
y=6x+4
when x=0 we get
y=6(0)+4=4
so that is a positive y-intercept
for
y=3x-2
when x=0 we get
y=3(0)-2=-2
so that is a negative y-intercept

Answer 5

when x=0 for
y=2x
we get
y=2(0)=0
so the y-intercept is 0, neither positive nor negative

Answer 6

got it. thanks