I just don't understand at all. Could you maybe give me an example, then show your work and solve it?

Hi Edgar;

Slope-intercept form is...

y=mx+b

m is the slope.

b is the y-intercept, the value of y when x=0.

y=3x+b

We are given a point, (2, 3). Let's plug it in...

3=3(2)+b

3=6+b

Let's subtract 6 from both sides...

-6+3=6+b-6

-3=b

The equation is...

y=3x-3