Y-intercept always has an x-coordinate of 0. what number can substitute for x in the equation to find the y-intercept? show how to do this

So, if you're trying to solve an equation, here's an example:

2x + 4y = 8 
You would minus 2x from both sides. (you want to get the equation into a mx + b format)
4y= -2x + 8
you would now divide both sides by 4
y = -1/2x + 2
So now that your equation is in y = mx+b, you should know your answer.

mx= to slope
b= y-intercept

so, therefore, your y-intercept is 2.