Line B is perpendicular to Line A if its slope is the negative reciprocal of the slope of Line A.
When a linear equation is in the form
y = mx + b,
m is the slope, and b is the y-intercept. So, for example,
y = (2/3)x + 5
is perpendicular to
y = (-3/2)x + 7.
(The y-intercepts in these two equations are random numbers.)
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If the straight line equation was: y = 5x+7 then its perpendicular equation could be y = -1/5x+7
"Y = any number" is perpendicular to "x = -3".
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.
y = x
It would be perpendicular to a line with the equation Y = 1/8 X.
Yes, I could, if I knew the slope of the line given.