You can use intercept form to graph and write quadratic functions.
y=a(x-p)(x-q)
You can also use intercept form to graph and write cubic functions.
y=a(x-p)(x-q)(x-r)
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You cannot.
If the slope-intercept equation is in the form: y = mx + b then the y-coordinate of the intercept is b
In the case that you are using Slope-Intercept Form, no, you only plot two points: the y-intercept and one other point. If you don't use Slope-Intercept Form, then you have to use three points.
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When you are trying to graph an equation.