y=-2x+3
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Take the negative reciprocal of the lines slope you want it to be perpendicular to. For example y = 3x +2; perpendicular line slope is -1/3.
Any vertical line has an undefined slope. The equation of the vertical line is x = a where the x-intercept is a.
If you have any expression that defines a line, you can find the slope of the line. After you have found the slope of the line, you can then write an expression describing the line in slope intercept form. You can't define a slope-intercept form for any nonlinear equation, because the slope is always* changing; there are often several intercepts as well.
As for example if the slope is 3 and the y intercept is 6 then the equation is: y=3x+6
Yes