SOLUTION: through (3,-9) and perpendicular to 2x+y=0. How do I put this in standard form?

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Question 280265: through (3,-9) and perpendicular to 2x+y=0. How do I put this in standard form?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
for a perpendicular line
___ swap the x and y coefficients, and change ONE of the signs

use the given point to find the new constant term

x - 2y = ? ___ 3 - [2(-9)] = 21

new equation is ___ x - 2y = 21