SOLUTION: 9x+4y=1
4x-9y=3
which is it parallel, perpendicular, or neither?
Explain your answer?
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Question 179895: 9x+4y=1
4x-9y=3
which is it parallel, perpendicular, or neither?
Explain your answer?
Answer by HyperBrain(694) (Show Source): You can put this solution on YOUR website!
9x+4y=1
4y=-9x+1
y=-9/4x+1/4
The slope of this line is -9/4
4x-9y=3
9y=4x-3
y=4/9x-1/3
The slope of this line is 4/9.
-9/4 and 4/9 are negative reciprocals. Therefore, the lines are perpendicular.
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